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Exception thrown in nested_navigation example #144

Closed
radoslaw-sz opened this issue Mar 23, 2021 · 10 comments
Closed

Exception thrown in nested_navigation example #144

radoslaw-sz opened this issue Mar 23, 2021 · 10 comments
Labels
bug Something isn't working P0 Priority 0; do immediately
Milestone
v0.11.0

Comments

@radoslaw-sz
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There is an exception thrown while using nested_navigation example from examples.

══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following TypeErrorImpl was thrown during a scheduler callback:
Unexpected null value.

When the exception was thrown, this was the stack:
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 236:49      throw_
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 518:63  nullCheck
packages/flutter/src/widgets/router.dart 490:79                                                                                [_retrieveNewRouteInformation]
packages/flutter/src/widgets/router.dart 465:52                                                                                [_reportRouteInformation]
packages/flutter/src/scheduler/binding.dart 1144:15                                                                            [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1090:9                                                                             handleDrawFrame
packages/flutter/src/scheduler/binding.dart 865:7                                                                              <fn>
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19           internalCallback
════════════════════════════════════════════════════════════════════════════════════════════════════
@devj3ns
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devj3ns commented Mar 23, 2021

I cannot reproduce this. When exactly does this exception get thrown?

@slovnicki
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Does this error appear in v0.10.2 / v1.0.0-nullsafety.6? I have a feeling that exactly this was fixed there

@radoslaw-sz
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@devj3ns it has been thrown at the very beginning of the application.
@slovnicki it is visible in v0.10.2, however on v1.0.0-nullsafety.6 I have different problem (see below).

I am working with Web.

Logs of nullsafety 

The following LateError was thrown building IconTheme(color: Color(0xdd000000)):
LateInitializationError: Field '_uri' has not been initialized.

The relevant error-causing widget was:
  MaterialApp file:///G:/bird/bird/bug/lib/main.dart:12:24

When the exception was thrown, this was the stack:
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 236:49  throw_
packages/beamer/src/beamer_router_delegate.dart 11:12                                                                      get [_uri]
packages/beamer/src/beamer_router_delegate.dart 12:18                                                                      get uri
packages/beamer/src/beamer_router_delegate.dart 378:35                                                                     get currentConfiguration
packages/beamer/src/beamer_router_delegate.dart 287:32                                                                     [_update]
packages/beamer/src/beamer_router_delegate.dart 167:5                                                                      beamTo
packages/beamer/src/beamer_router_delegate.dart 383:7                                                                      setNewRoutePath
packages/flutter/src/widgets/router.dart 1077:12                                                                           setInitialRoutePath
packages/flutter/src/foundation/synchronous_future.dart 41:35                                                              then
packages/flutter/src/widgets/router.dart 591:101                                                                           [_processInitialRoute]
packages/flutter/src/widgets/router.dart 430:7                                                                             initState
packages/flutter/src/widgets/framework.dart 4632:57                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 5974:14                                                                        mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 5974:14                                                                        mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 5974:14                                                                        mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4667:11                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4658:11                                                                        [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/framework.dart 4520:16                                                                        performRebuild
packages/flutter/src/widgets/framework.dart 4189:5                                                                         rebuild
packages/flutter/src/widgets/framework.dart 4474:5                                                                         [_firstBuild]
packages/flutter/src/widgets/framework.dart 4469:5                                                                         mount
packages/flutter/src/widgets/framework.dart 3541:13                                                                        inflateWidget
packages/flutter/src/widgets/framework.dart 3306:18                                                                        updateChild
packages/flutter/src/widgets/binding.dart 1182:16                                                                          [_rebuild]
packages/flutter/src/widgets/binding.dart 1153:5                                                                           mount
packages/flutter/src/widgets/binding.dart 1095:16                                                                          <fn>
packages/flutter/src/widgets/framework.dart 2647:19                                                                        buildScope
packages/flutter/src/widgets/binding.dart 1094:12                                                                          attachToRenderTree
packages/flutter/src/widgets/binding.dart 933:24                                                                           attachRootWidget
packages/flutter/src/widgets/binding.dart 915:7                                                                            <fn>
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19       internalCallback
flutter doctor 

[√] Flutter (Channel stable, 2.0.3, on Microsoft Windows [Version 10.0.19041.867], locale pl-PL)
    • Flutter version 2.0.3 at G:\IOT\flutter\flutter
    • Framework revision 4d7946a68d (5 days ago), 2021-03-18 17:24:33 -0700
    • Engine revision 3459eb2436
    • Dart version 2.12.2

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at C:\Users\Radek\AppData\Local\Android\sdk
    • Platform android-29, build-tools 29.0.2
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
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@tomosullivan8
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Hi, just to raise that I have the same issue (not from the nested_navigation example). I'm currently on beamer: ^0.10.2, but also had the issue on v0.10.0 and v0.10.1.

══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following TypeErrorImpl was thrown during a scheduler callback:
Unexpected null value.

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 236:49      throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 518:63  nullCheck
packages/flutter/src/widgets/router.dart 490:79                                   [_retrieveNewRouteInformation]
packages/flutter/src/widgets/router.dart 465:52                                   [_reportRouteInformation]
packages/flutter/src/scheduler/binding.dart 1144:15                               [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1090:9                                handleDrawFrame
packages/flutter/src/scheduler/binding.dart 865:7                                 <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19           internalCallback
════════════════════════════════════════════════════════════════════════════════════════════════════

@slovnicki slovnicki added bug Something isn't working P0 Priority 0; do immediately labels Mar 23, 2021
@slovnicki
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@mordivgor @tomosullivan8 is it maybe that you have this error, but the application runs OK?

@slovnicki slovnicki added the working on This issue is currently being worked on label Mar 23, 2021
@tomosullivan8
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Yeh, it seems to be running fine, I do get the exception of Unexpected null value. each time I beam to a new page, but doesn't cause issues, but I wonder if that's related to my implementation.

I'll try and take a look later and confirm!

@slovnicki
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slovnicki commented Mar 23, 2021 •
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@tomosullivan8 No, it's definitely not your fault. I saw this error before and can confirm that I see it now also.

It's somehow related to the relationship among multiple Beamers , because the error is not present when using just 1 Beamer/BeamerRouterDelegate. I haven't yet pinpointed the exact cause.

@radoslaw-sz
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I can confirm that application runs ok, just the exception is thrown.
When I have been trying to analyze this case, the problem was somehow connected to existence of RootRouterDelegate and Beamer - when it came to this part of the code:

final T? configuration = widget.routerDelegate.currentConfiguration;
    if (configuration == null)
      return null;
    final RouteInformation? routeInformation = widget.routeInformationParser!.restoreRouteInformation(configuration);

It shows that when routerDelegate is RootRouterDelegate then routeInformationParser is not null.
When routerDelegate is BeamerRouterDelegate (which is visible for nested routes), routeInformationParser is not available.

@slovnicki
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slovnicki commented Mar 23, 2021 •
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@mordivgor thanks for your valuable insight. I was able to figure out that I should then have currentConfiguration = null for inner beamers. Try from master:

beamer:
  git:
    url: https://github.com/slovnicki/beamer.git

it should be without exceptions now.

When you or @tomosullivan8 confirm it's alright, I will release it as v0.10.3 / v1.0.0-nullsafety.7

@slovnicki slovnicki removed the working on This issue is currently being worked on label Mar 23, 2021
@tomosullivan8
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Can confirm its without exception, thanks for fixing!

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@devj3ns @slovnicki @tomosullivan8 @radoslaw-sz