Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.

[ClecknerT]

I am having issues getting the speed to update when Firestore Stream is triggered. I am getting the following error which I suspect is the issue.

Built build/app/outputs/flutter-apk/app-debug.apk.
: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/lib/kdgaugeview.dart:95

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../../../snap/flutter/common/flutter/packages/flutter/lib/src/widgets/binding.dart').
  package:flutter/…/widgets/binding.dart:1
  WidgetsBinding.instance!.addPostFrameCallback((timeStamp) {