[BUG]: Error Widget

[CleoMenezesJr]

Null check operator used on a null value

0 SelectableRegionState.startGlyphHeight (package:flutter/src/widgets/selectable_region.dart:1299)

1 SelectableRegionState.contextMenuAnchors (package:flutter/src/widgets/selectable_region.dart:1143)

2 new AdaptiveTextSelectionToolbar.selectableRegion (package:flutter/src/material/adaptive_text_selection_toolbar.dart:179)

3 SelectionArea._defaultContextMenuBuilder (package:flutter/src/material/selection_area.dart:96)

4 SelectableRegionState._onAnyDragEnd. (package:flutter/src/widgets/selectable_region.dart:736)

5 SelectionOverlay.showToolbar. (package:flutter/src/widgets/text_selection.dart:1436)

6 ContextMenuController.show. (package:flutter/src/widgets/context_menu_controller.dart:65)

7 _OverlayEntryWidgetState.build (package:flutter/src/widgets/overlay.dart:398)

8 StatefulElement.build (package:flutter/src/widgets/framework.dart:5599)

9 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5487)

10 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5650)

11 Element.rebuild (package:flutter/src/widgets/framework.dart:5203)

12 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2905)

13 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1136)

14 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:443)

15 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1392)

16 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1313)

17 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1171)

18 _invoke (dart:ui/hooks.dart:312)

19 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:419)

20 _drawFrame (dart:ui/hooks.dart:283)