NoSuchMethod error for `.remove()`
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When added / removing the widget a few times
I ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I The following NoSuchMethodError was thrown building BlocBuilder<MyEvent, MyViewState>:
I The method 'remove' was called on null.
I Receiver: null
I Tried calling: remove()
I When the exception was thrown, this was the stack:
I #0 ChangeNotifier.removeListener (package:flutter/src/foundation/change_notifier.dart:167)
I #1 _IjkPlayerState.deactivate (package:flutter_ijk/flutter_ijk.dart:498)
I #2 StatefulElement.deactivate (package:flutter/src/widgets/framework.dart:3914)
I #3 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1714)
I #4 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4869)
I #5 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1716)
I #6 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4970)
I #7 _InactiveElements._deactivateRecursively (package:flutter/src/widgets/framework.dart:1716)
I #8 _InactiveElements.add (package:flutter/src/widgets/framework.dart:1725)
I #9 Element.deactivateChild (package:flutter/src/widgets/framework.dart:2996)
I #10 Element.updateChild (package:flutter/src/widgets/framework.dart:2760)
I #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3752)
I #12 Element.rebuild (package:flutter/src/widgets/framework.dart:3564)
I #13 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2277)
I #14 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter
/src/widgets/binding.dart:700)
I #15 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:f
lutter/src/rendering/binding.dart:275)
I #16 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1012)
I #17 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:952)
I #18 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:864)
I #22 _invoke (dart:ui/hooks.dart:219)
I #23 _drawFrame (dart:ui/hooks.dart:178)
I (elided 3 frames from package dart:async)