![package:flutter/src/widgets/navigator.dart': Failed assertion: line 5139 pos 12: '!_debugLocked': is not true. · Issue #104957 · flutter/flutter · GitHub package:flutter/src/widgets/navigator.dart': Failed assertion: line 5139 pos 12: '!_debugLocked': is not true. · Issue #104957 · flutter/flutter · GitHub](https://user-images.githubusercontent.com/60320246/170952531-0dc0de86-5ad0-4ac4-ad3d-9608eee04a03.png)
package:flutter/src/widgets/navigator.dart': Failed assertion: line 5139 pos 12: '!_debugLocked': is not true. · Issue #104957 · flutter/flutter · GitHub
![flutter - Error: RenderBox was not laid out, Failed assertion: line 1940 pos 12: 'hasSize' - Stack Overflow flutter - Error: RenderBox was not laid out, Failed assertion: line 1940 pos 12: 'hasSize' - Stack Overflow](https://i.stack.imgur.com/WBnJv.png)
flutter - Error: RenderBox was not laid out, Failed assertion: line 1940 pos 12: 'hasSize' - Stack Overflow
Serializations of assert expressions in dart:ui are "<optimized out>". · Issue #71790 · flutter/flutter · GitHub
![package: flutter/src/widgets/fade_in_image.dart' : Failed assertion: line 234 pos 15: 'image != null': is not true - Stack Overflow package: flutter/src/widgets/fade_in_image.dart' : Failed assertion: line 234 pos 15: 'image != null': is not true - Stack Overflow](https://i.stack.imgur.com/pBkU5.jpg)
package: flutter/src/widgets/fade_in_image.dart' : Failed assertion: line 234 pos 15: 'image != null': is not true - Stack Overflow
![api - Flutter: A non-null String must be provided to a Text widget. Failed assertion: line 378 pos 10: 'data != null' - Stack Overflow api - Flutter: A non-null String must be provided to a Text widget. Failed assertion: line 378 pos 10: 'data != null' - Stack Overflow](https://i.stack.imgur.com/mrWBM.png)
api - Flutter: A non-null String must be provided to a Text widget. Failed assertion: line 378 pos 10: 'data != null' - Stack Overflow
![flutter - Error: Can't assign to the final variable 'color'. assert(color = null || decoration == null, ^^^^^ - Stack Overflow flutter - Error: Can't assign to the final variable 'color'. assert(color = null || decoration == null, ^^^^^ - Stack Overflow](https://i.stack.imgur.com/3Hr7u.png)