animation crash

[nitneuq33]

I have a bug with flare package.

I have a tab bar with 3 pages,

first tab I stack 3 flare animation. Specificity : for each initState I load the asset name with sharedpref to display the saved animation.
Second and third tab nothing special

When I slide tab 1 to 2 and 2 to 1 x Time , sometime I have crash only for this stack flare animation, not for others animation.

exemple :

//I load at the init of the tab1 the asset name saved previously

  asset_name_animation=prefs.getString('item' )??"fond_vide";  



// I display the asset name loaded
         new Container (
                                    width:400,
                                    height: 400,
                                    child :new FlareActor("assets/$asset_name_animation.flr", alignment:Alignment.bottomCenter, fit:BoxFit.contain,  animation: "Untitled")
                                ),

Here is the error :

E/flutter ( 9171): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Unable to load asset: assets/null.flr
E/flutter ( 9171): #0      PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7)
E/flutter ( 9171): <asynchronous suspension>
E/flutter ( 9171): #1      FlareCacheAsset.load (package:flare_flutter/flare_cache_asset.dart:31:20)
E/flutter ( 9171): #2      Cache.getAsset (package:flare_flutter/cache.dart:56:15)
E/flutter ( 9171): <asynchronous suspension>
E/flutter ( 9171): #3      cachedActor (package:flare_flutter/flare_cache.dart:35:16)
E/flutter ( 9171): <asynchronous suspension>
E/flutter ( 9171): #4      FlareRenderBox.loadFlare (package:flare_flutter/flare_render_box.dart:322:35)
E/flutter ( 9171): <asynchronous suspension>
E/flutter ( 9171): #5      FlareActorRenderObject.coldLoad (package:flare_flutter/flare_actor.dart:321:20)
E/flutter ( 9171): <asynchronous suspension>
E/flutter ( 9171): #6      FlareRenderBox.load (package:flare_flutter/flare_render_box.dart:272:7)
E/flutter ( 9171): #7      FlareRenderBox.attach (package:flare_flutter/flare_render_box.dart:115:7)
E/flutter ( 9171): #8      AbstractNode.adoptChild (package:flutter/src/foundation/node.dart:132:13)
E/flutter ( 9171): #9      RenderObject.adoptChild (package:flutter/src/rendering/object.dart:1153:11)
E/flutter ( 9171): #10     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin.child= (package:flutter/src/rendering/object.dart:2772:7)
E/flutter ( 9171): #11     SingleChildRenderObjectElement.insertChildRenderObject (package:flutter/src/widgets/framework.dart:5107:18)
E/flutter ( 9171): #12     RenderObjectElement.attachRenderObject (package:flutter/src/widgets/framework.dart:4951:35)
E/flutter ( 9171): #13     RenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4717:5)
E/flutter ( 9171): #14     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
E/flutter ( 9171): #15     Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
E/flutter ( 9171): #16     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
E/flutter ( 9171): #17     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
E/flutter ( 9171): #18     Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
E/flutter ( 9171): #19     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
E/flutter ( 9171): #20     Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
E/flutter ( 9171): #21     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
E/flutter ( 9171): #22     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
E/flutter ( 9171): #23     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
E/flutter ( 9171): #24     Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
E/flutter ( 9171): #25     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
E/flutter ( 9171): #26     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
E/flutter ( 9171): #27     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5198:32)
E/flutter ( 9171): #28     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
E/flutter ( 9171): #29     Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
E/flutter ( 9171): #30     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
E/flutter ( 9171): #31     Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
E/flutter ( 9171): #32     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
E/flutter ( 9171): #33     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
E/flutter ( 9171): #34     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
E/flutter ( 9171): #35     Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
E/flutter ( 9171): #36     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5092:14)
E/flutter ( 9171): #37     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3084:14)
E/flutter ( 9171): #38     Element.updateChild (package:flutter/src/widgets/framework.dart:2887:12)
E/flutter ( 9171): #39     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3935:16)
E/flutter ( 9171): #40     Element.rebuild (package:flutter/src/widgets/framework.dart:3721:5)
E/flutter ( 9171): #41     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3907:5)
E/flutter ( 9171): #42     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3902:5)
E/flutter ( 9171): #43     ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4279:11)
E/flutter ( 9171): #44     Element.inflateWidget (pac

I have an other crash who is repetable and have same animation issue : all time when I launch a route => back => slide tab 2 => slide tab 1, I have this error and animation crash.

E/flutter ( 9171): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Looking up a deactivated widget's ancestor is unsafe.
E/flutter ( 9171): At this point the state of the widget's element tree is no longer stable.
E/flutter ( 9171): To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling inheritFromWidgetOfExactType() in the widget's didChangeDependencies() method.
E/flutter ( 9171): #0      Element._debugCheckStateIsActiveForAncestorLookup.<anonymous closure> (package:flutter/src/widgets/framework.dart:3389:9)
E/flutter ( 9171): #1      Element._debugCheckStateIsActiveForAncestorLookup (package:flutter/src/widgets/framework.dart:3403:6)
E/flutter ( 9171): #2      Element.inheritFromWidgetOfExactType (package:flutter/src/widgets/framework.dart:3418:12)
E/flutter ( 9171): #3      TickerMode.of (package:flutter/src/widgets/ticker_provider.dart:52:39)
E/flutter ( 9171): #4      _analyse2State&State&WidgetsBindingObserver&TickerProviderStateMixin.didChangeDependencies (package:flutter/src/widgets/ticker_provider.dart:197:36)
E/flutter ( 9171): #5      analyse2State.didChangeDependencies (package:ouiquit_app/tableau_de_bord.dart:5533:11)
E/flutter ( 9171): #6      _asyncThenWrapperHelper.<anonymous closure> (dart:async-patch/async_patch.dart:77:64)
E/flutter ( 9171): #7      _rootRunUnary (dart:async/zone.dart:1132:38)
E/flutter ( 9171): #8      _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter ( 9171): #9      _FutureListener.handleValue (dart:async/future_impl.dart:126:18)
E/flutter ( 9171): #10     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:639:45)
E/flutter ( 9171): #11     Future._propagateToListeners (dart:async/future_impl.dart:668:32)
E/flutter ( 9171): #12     Future._complete (dart:async/future_impl.dart:473:7)
E/flutter ( 9171): #13     _SyncCompleter.complete (dart:async/future_impl.dart:51:12)
E/flutter ( 9171): #14     _AsyncAwaitCompleter.complete.<anonymous closure> (dart:async-patch/async_patch.dart:33:20)
E/flutter ( 9171): #15     _rootRun (dart:async/zone.dart:1120:38)
E/flutter ( 9171): #16     _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter ( 9171): #17     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
E/flutter ( 9171): #18     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
E/flutter ( 9171): #19     _rootRun (dart:async/zone.dart:1124:13)
E/flutter ( 9171): #20     _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter ( 9171): #21     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
E/flutter ( 9171): #22     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
E/flutter ( 9171): #23     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter ( 9171): #24     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
E/flutter ( 9171): 

thank you

[luigi-rosso]

It seems like somehow the asset_name_animation value gets set to null, maybe some race condition with how you acquire that value?

Could you share a small example project that shows the issue?

[nitneuq33]

I solved it with

Navigator.pushAndRemoveUntil(context, MaterialPageRoute(
builder: (context) => DrawerPage(),
), (e) => false);