Crash seen below. Likely culprit PR here: #108913.

Stack Trace:
at EditableTextState.toggleToolbar (editable_text.dart:3320 )
at TextSelectionGestureDetectorBuilder.onSingleTapUp (text_selection.dart:1885 )
at _TextFieldSelectionGestureDetectorBuilder.onSingleTapUp (text_field.dart:92 )
at _TextFieldSelectionGestureDetectorBuilder.onSingleTapUp (text_field.dart:90 )
at _TextSelectionGestureDetectorState._handleTapUp (text_selection.dart:2327 )
at _TextSelectionGestureDetectorState._handleTapUp (text_selection.dart:2325 )
at TapGestureRecognizer.handleTapUp. (tap.dart:624 )
at GestureRecognizer.invokeCallback (recognizer.dart:253 )
at TapGestureRecognizer.handleTapUp (tap.dart:624 )
at BaseTapGestureRecognizer._checkUp (tap.dart:306 )
at BaseTapGestureRecognizer.acceptGesture (tap.dart:276 )
at GestureArenaManager.sweep (arena.dart:163 )
at GestureBinding.handleEvent (binding.dart:464 )
at GestureBinding.dispatchEvent (binding.dart:440 )
at RendererBinding.dispatchEvent (binding.dart:333 )
at GestureBinding._handlePointerEventImmediately (binding.dart:395 )
at GestureBinding._flushPointerEventQueue (binding.dart:357 )
at GestureBinding._handlePointerDataPacket (binding.dart:295 )
at GestureBinding._handlePointerDataPacket (binding.dart:290 )
at _invoke1 (hooks.dart:164 )
at PlatformDispatcher._dispatchPointerDataPacket (platform_dispatcher.dart:339 )
at _dispatchPointerDataPacket (hooks.dart:91 )