Exception caught by scheduler library ═════════════════════════════════
'package:flutter/src/rendering/mouse_tracker.dart': Failed assertion: line 200 pos 12: '!_debugDuringDeviceUpdate': is not true.


Then this also: 
The following assertion was thrown during a scheduler callback:
'package:flutter/src/rendering/mouse_tracker.dart': Failed assertion: line 200 pos 12: '!_debugDuringDeviceUpdate': 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.

When the exception was thrown, this was the stack:
#2      MouseTracker._deviceUpdatePhase (package:flutter/src/rendering/mouse_tracker.dart:200:12)
mouse_tracker.dart:200
#3      MouseTracker.updateAllDevices (package:flutter/src/rendering/mouse_tracker.dart:367:5)
mouse_tracker.dart:367
#4      RendererBinding._scheduleMouseTrackerUpdate.<anonymous closure> (package:flutter/src/rendering/binding.dart:485:22)
binding.dart:485
#5      SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1397:15)
binding.dart:1397
#6      SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1331:11)
binding.dart:1331
#7      SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:1040:9)
binding.dart:1040
#8      PlatformDispatcher.scheduleWarmUpFrame.<anonymous closure> (dart:ui/platform_dispatcher.dart:837:16)
platform_dispatcher.dart:837
#12     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
isolate_patch.dart:184
(elided 5 frames from class _AssertionError, class _Timer, and dart:async-patch). 

Any possible fixes will be appreciated.