Null check operator used on a null value

[doronnahum]

Hi,
in some cases when i change view
i get this exception:

location: GetStream.removeSubscription (package:get/get_rx/src/rx_stream/get_stream.dart:22:17)
error: Null check operator used on a null value
code: "
FutureOr<bool?> removeSubscription(LightSubscription subs) async {
if (!_isBusy!) {
"

#0 GetStream.removeSubscription (package:get/get_rx/src/rx_stream/get_stream.dart:22:17)
#1 LightSubscription.cancel (package:get/get_rx/src/rx_stream/get_stream.dart:148:24)
#2 NotifyManager.close. (package:get/get_rx/src/rx_types/rx_core/rx_impl.dart:183:22)
#3 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:539:8)
#4 NotifyManager.close (package:get/get_rx/src/rx_types/rx_core/rx_impl.dart:181:20)
#5 _ObxState.dispose (package:get/get_state_manager/src/rx_flutter/rx_obx_widget.dart:48:15)
#6 StatefulElement.unmount (package:flutter/src/widgets/framework.dart:4818:11)
#7 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1883:13)
#8 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#9 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
#10 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#11 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#12 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:6110:14)
#13 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#14 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#15 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:6110:14)
#16 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#17 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#18 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:6110:14)
#19 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#20 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#21 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
#22 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#23 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#24 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:6225:16)
#25 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#26 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#27 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:6110:14)
#28 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#29 _InactiveElements._unmount. (package:flutter/src/widgets/framework.dart:1881:7)
#30 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
#31 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1879:13)
#32 ListIterable.forEach (dart:_internal/iterable.dart:39:13)
#33 _InactiveElements._unmountAll (package:flutter/src/widgets/framework.dart:1892:25)
#34 BuildOwner.finalizeTree. (package:flutter/src/widgets/framework.dart:2837:27)
#35 BuildOwner.lockState (package:flutter/src/widgets/framework.dart:2468:15)
#36 BuildOwner.finalizeTree (package:flutter/src/widgets/framework.dart:2836:7)
#37 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:884:19)
#38 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
#39 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1145:15)
#40 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
#41 SchedulerBinding.scheduleWarmUpFrame. (package:flutter/src/scheduler/binding.dart:863:7)
#42 Timer._createTimer. (dart:async-patch/timer_patch.dart:18:15)
#43 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:395:19)
#44 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:426:5)
#45 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)

[hungryemon]

Same Issure

[igorvidottof]

Same here... Any updates on that?

[GelidGeorge]

try something like this...

Closing RxFoo in OnClose() {
rxFoo.subject.isClosed? rxFoo.close() : null
}

this is not healthy but a quick fix...

or Do Your Navigation and State Management Differently and Efficeiently.

[macy11]

What's the reason?

[GelidGeorge]

Some streams might be closed in some other methods of a class, this results in trying to close a stream that's already closed. So better thing to do is check if the stream in question is already closed or create a clean code that will not result in this to happen. I recommend using “flutter_bloc” as this is an overkill and doesn't give many options like “go_router” and “flutter_bloc” gives you. Well, I have decided not use getx any time soon for any of the projects that I do in the near future.

[jahidsakan]

Im facing same issue . any solution?