[ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: 'package:flutter/src/rendering/mouse_tracking.dart': Failed assertion: line 423 pos 18: 'event is! PointerRemovedEvent': is not true.
#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39)
#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5)
#2      BaseMouseTracker.updateWithEvent.<anonymous closure>.<anonymous closure> (package:flutter/src/rendering/mouse_tracking.dart:423:18)
#3      BaseMouseTracker._deviceUpdatePhase (package:flutter/src/rendering/mouse_tracking.dart:316:9)
#4      BaseMouseTracker.updateWithEvent.<anonymous closure> (package:flutter/src/rendering/mouse_tracking.dart:418:7)
#5      BaseMouseTracker._monitorMouseConnection (package:flutter/src/rendering/mouse_tracking.dart:300:9)
#6      BaseMouseTracker.updateWithEvent (package:flutter/src/rendering/mouse_tracking.dart:417:5)
#7      RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:275:22)
#8      GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:316:7)
#9      GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:280:5)
#10     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:238:7)
#11     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:221:7)
#12     _rootRunUnary (dart:async/zone.dart:1370:13)
#13     _CustomZone.runUnary (dart:async/zone.dart:1265:19)
#14     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1170:7)
#15     _invoke1 (dart:ui/hooks.dart:186:10)
#16     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:282:7)
#17     _dispatchPointerDataPacket (dart:ui/hooks.dart:96:31)


======== Exception caught by scheduler library =====================================================
The following assertion was thrown during a scheduler callback:
'package:flutter/src/rendering/mouse_tracking.dart': Failed assertion: line 311 pos 12: '!_debugDuringDeviceUpdate': is not true.

When the exception was thrown, this was the stack: 
#2      BaseMouseTracker._deviceUpdatePhase (package:flutter/src/rendering/mouse_tracking.dart:311:12)
#3      BaseMouseTracker.updateAllDevices (package:flutter/src/rendering/mouse_tracking.dart:460:5)
#4      RendererBinding._scheduleMouseTrackerUpdate.<anonymous closure> (package:flutter/src/rendering/binding.dart:336:22)
#5      SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
#6      SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1090:9)

flutter doctor -v
[✓] Flutter (Channel dev, 1.27.0-1.0.pre, on macOS 11.2.1 20D74 darwin-arm, locale en-DE)
    • Flutter version 1.27.0-1.0.pre at /Users/tilo/development/flutter
    • Framework revision 68c96f100e (10 days ago), 2021-02-08 16:14:15 -0800
    • Engine revision b04955656c
    • Dart version 2.13.0 (build 2.13.0-0.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/tilo/Library/Android/sdk
    • Platform android-30, build-tools 30.0.3
    • ANDROID_SDK_ROOT = /Users/tilo/Library/Android/sdk
    • Java binary at: /Library/Java/JavaVirtualMachines/zulu-15.jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment Zulu15.29+15-CA (build 15.0.2+7)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
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[!] Android Studio (not installed)
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      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).

[✓] IntelliJ IDEA Community Edition (version 2020.3.2)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 53.1.5
    • Dart plugin version 203.6912

[✓] Connected device (3 available)
    • Pixel 5 (mobile) • 08081FDD4002T6 • android-arm64  • Android 11 (API 30)
    • macOS (desktop)  • macos          • darwin-arm64   • macOS 11.2.1 20D74 darwin-arm
    • Chrome (web)     • chrome         • web-javascript • Google Chrome 88.0.4324.182

! Doctor found issues in 1 category.