FlutterError - Null check operator used on a null value - _AppShellState.initState.<fn>

[krushnarout]

_AppShellState.initState.
io.flutter.plugins.firebase.crashlytics.FlutterError - Null check operator used on a null value

https://console.firebase.google.com/u/0/project/based-hardware/crashlytics/app/android:com.friend.ios/issues/b9a5d81ca933bac4ad5ae0c44cec0631?time=7d&types=crash&sessionEventKey=695E54BB01F7000104D7B432525AF1A0_2171045954920968217

logs:

          Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value
       at State.context(framework.dart:959)
       at _AppShellState.initState.<fn>(app_shell.dart:378)