Expected a value of type 'SkDeletable', but got one of type 'Null'

Question

I have updated my flutter project from 1.26.3 to 2.1.0. Since then I am facing some issue. I am getting error as "Expected a value of type 'SkDeletable', but got one of type 'Null'".

Does anybody knows what is related with?

Answer 1

I got the same error with the following code snippet:

BackdropFilter(
        filter: ImageFilter.blur(
        
          sigmaX: animation.value * 5.0),
          sigmaY: animation.value * 5.0),
        ),
        child: Container(
          color: Colors.transparent,
        ),
      ),

The error gets thrown because the animation goes from 0 to 1. More precisely, the ImageFilter does not work with values equal to zero. A quick work-around is something like:

max(0.001, animation.value * 5.0)

so no zero value is passed to the Filter.

Answer 2

I resolved my running the following commands on the terminal

• flutter clean
• flutter pub get
• flutter run I hope it resolves your issue

Answer 3

It is most likely related to flushbar lib you might be using, try to use another_flushbar, as it has this problem solved and has the same api.

Answer 4

If you run your project in release or profile the error probably won't exist:

flutter run -d chrome --profile
flutter run -d chrome --release

At the same time if you get your --debug app and open it in Safari (for example) the error won't exist (most probably). It seems like an issue with Chrome (again).