Seems to always happen 3 times

======== Exception caught by services library ======================================================
The following assertion was thrown during a platform message callback:
RenderParagraph._scheduleSystemFontsUpdate() called during SchedulerPhase.midFrameMicrotasks.
'package:flutter/src/rendering/object.dart':
Failed assertion: line 4449 pos 7: 'SchedulerBinding.instance.schedulerPhase == SchedulerPhase.idle'


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.yml

When the exception was thrown, this was the stack: 
#2      RelayoutWhenSystemFontsChangeMixin._scheduleSystemFontsUpdate (package:flutter/src/rendering/object.dart:4449:7)
#3      _SystemFontsNotifier.notifyListeners (package:flutter/src/painting/binding.dart:187:15)
#4      PaintingBinding.handleSystemMessage (package:flutter/src/painting/binding.dart:176:22)
<asynchronous suspension>
#5      BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:235:36)
<asynchronous suspension>
#6      _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:581:22)
<asynchronous suspension>
(elided 2 frames from class _AssertionError)
====================================================================================================

======== Exception caught by services library ======================================================
The following assertion was thrown during a platform message callback:
RenderParagraph._scheduleSystemFontsUpdate() called during SchedulerPhase.midFrameMicrotasks.
'package:flutter/src/rendering/object.dart':
Failed assertion: line 4449 pos 7: 'SchedulerBinding.instance.schedulerPhase == SchedulerPhase.idle'


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.yml

When the exception was thrown, this was the stack: 
#2      RelayoutWhenSystemFontsChangeMixin._scheduleSystemFontsUpdate (package:flutter/src/rendering/object.dart:4449:7)
#3      _SystemFontsNotifier.notifyListeners (package:flutter/src/painting/binding.dart:187:15)
#4      PaintingBinding.handleSystemMessage (package:flutter/src/painting/binding.dart:176:22)
<asynchronous suspension>
#5      BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:235:36)
<asynchronous suspension>
#6      _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:581:22)
<asynchronous suspension>
(elided 2 frames from class _AssertionError)
====================================================================================================

======== Exception caught by services library ======================================================
The following assertion was thrown during a platform message callback:
RenderParagraph._scheduleSystemFontsUpdate() called during SchedulerPhase.midFrameMicrotasks.
'package:flutter/src/rendering/object.dart':
Failed assertion: line 4449 pos 7: 'SchedulerBinding.instance.schedulerPhase == SchedulerPhase.idle'


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.yml

When the exception was thrown, this was the stack: 
#2      RelayoutWhenSystemFontsChangeMixin._scheduleSystemFontsUpdate (package:flutter/src/rendering/object.dart:4449:7)
#3      _SystemFontsNotifier.notifyListeners (package:flutter/src/painting/binding.dart:187:15)
#4      PaintingBinding.handleSystemMessage (package:flutter/src/painting/binding.dart:176:22)
<asynchronous suspension>
#5      BasicMessageChannel.setMessageHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:235:36)
<asynchronous suspension>
#6      _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:581:22)
<asynchronous suspension>
(elided 2 frames from class _AssertionError)
====================================================================================================

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