Assertion failure: Looking up a deactivated widget's ancestor is unsafe.

The following log message seems to happen any time a character is entered in a field. I'm using pin_code_fields: ^7.4.0.

======== Exception caught by widgets library =======================================================
The following assertion was thrown while dispatching notifications for FocusManager:
Looking up a deactivated widget's ancestor is unsafe.

At this point the state of the widget's element tree is no longer stable.

To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling dependOnInheritedWidgetOfExactType() in the widget's didChangeDependencies() method.

When the exception was thrown, this was the stack: 
#0      Element._debugCheckStateIsActiveForAncestorLookup.<anonymous closure> (package:flutter/src/widgets/framework.dart:4241:9)
#1      Element._debugCheckStateIsActiveForAncestorLookup (package:flutter/src/widgets/framework.dart:4255:6)
#2      Element.dependOnInheritedWidgetOfExactType (package:flutter/src/widgets/framework.dart:4275:12)
#3      MediaQuery.maybeOf (package:flutter/src/widgets/media_query.dart:922:20)
#4      _InkResponseState._shouldShowFocus (package:flutter/src/material/ink_well.dart:997:44)
#5      _InkResponseState.updateFocusHighlights (package:flutter/src/material/ink_well.dart:1013:21)
#6      _InkResponseState.handleFocusHighlightModeChange.<anonymous closure> (package:flutter/src/material/ink_well.dart:992:7)
#7      State.setState (package:flutter/src/widgets/framework.dart:1114:30)
#8      _InkResponseState.handleFocusHighlightModeChange (package:flutter/src/material/ink_well.dart:991:5)
#9      FocusManager._notifyHighlightModeListeners (package:flutter/src/widgets/focus_manager.dart:1607:19)
#10     FocusManager._updateHighlightMode (package:flutter/src/widgets/focus_manager.dart:1583:7)
#11     FocusManager._handleKeyMessage (package:flutter/src/widgets/focus_manager.dart:1663:5)
#12     KeyEventManager._dispatchKeyMessage (package:flutter/src/services/hardware_keyboard.dart:824:34)
#13     KeyEventManager.handleRawKeyMessage (package:flutter/src/services/hardware_keyboard.dart:889:17)
#14     BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:197:49)
#15     _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:387:35)
#16     _invoke2 (dart:ui/hooks.dart:186:13)
#17     _ChannelCallbackRecord.invoke (dart:ui/channel_buffers.dart:42:5)
#18     _Channel.push (dart:ui/channel_buffers.dart:132:31)
#19     ChannelBuffers.push (dart:ui/channel_buffers.dart:329:17)
#20     PlatformDispatcher._dispatchPlatformMessage (dart:ui/platform_dispatcher.dart:599:22)
#21     _dispatchPlatformMessage (dart:ui/hooks.dart:89:31)
The FocusManager sending notification was: FocusManager#4ca5d
  primaryFocus: FocusNode#6ca59([PRIMARY FOCUS])
  primaryFocusCreator: Focus ← _ActionsMarker ← Actions ← _TextEditingHistory ← _ActionsMarker ← Actions ← MouseRegion ← EditableText-[LabeledGlobalKey<EditableTextState>#981ae] ← UnmanagedRestorationScope ← RepaintBoundary ← _Decorator ← InputDecorator ← AnimatedBuilder ← Listener ← RawGestureDetector ← TextSelectionGestureDetector ← Semantics ← AnimatedBuilder ← IgnorePointer ← MouseRegion ← ⋯
====================================================================================================

My widget instantiation:

    var textField = PinCodeTextField(
      appContext: context,
      animationType: AnimationType.fade,
      autoDisposeControllers: false,
      autoFocus: true,
      beforeTextPaste: (value) {
        return value != null && value.length == 4;
      },
      controller: _textEditingController,
      cursorColor: Theme.of(context).colorScheme.secondary,
      inputFormatters: [_UpperCaseTextFormatter()],
      length: Configuration.instance.shortCodeLength,
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      pinTheme: PinTheme(
        activeColor: Theme.of(context).colorScheme.onBackground,
        inactiveColor: Theme.of(context).colorScheme.onBackground,
        selectedColor: Theme.of(context).colorScheme.onBackground,
        fieldHeight: height * 1.5,
      ),
      textCapitalization: TextCapitalization.characters,
      textStyle: Theme.of(context).textTheme.displayMedium,
      onChanged: (_) {},
      onSubmitted: (value) => _submit(value, context: context),
      onCompleted: (value) => _submit(value, context: context),
    );

adar2378 / pin_code_fields

Assertion failure: Looking up a deactivated widget's ancestor is unsafe. #296