Failed assertion: line 887 pos 12: 'activity!.isScrolling': is not true. #87935

======== Exception caught by gesture ===============================================================
The following assertion was thrown while handling a gesture:
'package:flutter/src/widgets/scroll_position.dart': Failed assertion: line 887 pos 12: 'activity!.isScrolling': is not true.


Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

When the exception was thrown, this was the stack: 
#2      ScrollPosition.didOverscrollBy (package:flutter/src/widgets/scroll_position.dart:887:12)
#3      ScrollPosition.setPixels (package:flutter/src/widgets/scroll_position.dart:279:9)
#4      ScrollPositionWithSingleContext.setPixels (package:flutter/src/widgets/scroll_position_with_single_context.dart:82:18)
#5      ScrollPositionWithSingleContext.applyUserOffset (package:flutter/src/widgets/scroll_position_with_single_context.dart:124:5)
#6      ScrollDragController.update (package:flutter/src/widgets/scroll_activity.dart:387:14)