Assertion failure in gesture handling

assertion_failure.dart

I/flutter (23776): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
I/flutter (23776): The following assertion was thrown while handling a gesture:
I/flutter (23776): 'package:flutter/src/widgets/scrollable.dart': Failed assertion: line 425: '_hold != null': is not
I/flutter (23776): true.
I/flutter (23776): 
I/flutter (23776): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (23776): more information in this error message to help you determine and fix the underlying cause.
I/flutter (23776): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (23776):   https://github.com/flutter/flutter/issues/new
I/flutter (23776): 
I/flutter (23776): When the exception was thrown, this was the stack:
I/flutter (23776): #2      ScrollableState._handleDragStart (package:flutter/src/widgets/scrollable.dart:425)
I/flutter (23776): #3      DragGestureRecognizer.acceptGesture.<anonymous closure> (package:flutter/src/gestures/monodrag.dart:160)
I/flutter (23776): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102)
I/flutter (23776): #5      DragGestureRecognizer.acceptGesture (package:flutter/src/gestures/monodrag.dart:160)
I/flutter (23776): #6      GestureArenaManager._resolveInFavorOf (package:flutter/src/gestures/arena.dart:263)
I/flutter (23776): #7      GestureArenaManager._resolve (package:flutter/src/gestures/arena.dart:222)
I/flutter (23776): #8      GestureArenaEntry.resolve (package:flutter/src/gestures/arena.dart:52)
I/flutter (23776): #9      OneSequenceGestureRecognizer.resolve (package:flutter/src/gestures/recognizer.dart:166)
I/flutter (23776): #10     DragGestureRecognizer.handleEvent (package:flutter/src/gestures/monodrag.dart:147)
I/flutter (23776): #11     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73)
I/flutter (23776): #12     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101)
I/flutter (23776): #13     BindingBase&SchedulerBinding&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143)
I/flutter (23776): #14     BindingBase&SchedulerBinding&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121)
I/flutter (23776): #15     BindingBase&SchedulerBinding&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101)
I/flutter (23776): #16     BindingBase&SchedulerBinding&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64)
I/flutter (23776): #17     BindingBase&SchedulerBinding&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48)
I/flutter (23776): #18     _invoke1 (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.dart:100)
I/flutter (23776): #19     _dispatchPointerDataPacket (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.dart:58)
I/flutter (23776): (elided 2 frames from class _AssertionError)
I/flutter (23776): 
I/flutter (23776): Handler: onStart
I/flutter (23776): Recognizer:
I/flutter (23776):   HorizontalDragGestureRecognizer#b28a0
I/flutter (23776): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (23776): Another exception was thrown: 'package:flutter/src/widgets/scrollable.dart': Failed assertion: line 425: '_hold != null': is not true.