Unhandled Exception after build

Project Settings

Application doesn't work and throws an error 'Unhandled Exception: Null check operator used on a null value'

What have you tried so far?

My application doesn't work when I build APK by terminal. I run command 'flutter build apk'.
And when I run a ready app it doesn't work and it throws an error 'Unhandled Exception: Null check operator used on a null value'.

With that issue I can't use CodeMagic.

But when I click 'Download APK' by FlutterFlow interface it works fine.
What's the problem it can be?

Did you check FlutterFlow's Documentation for this topic?
Yes