Warning: Operand of null-aware operation '!'

[JoniJohn]

Below warning is displayed when I run my code on the emulator

/C:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_rounded_date_picker-2.0.2/lib/src/flutter_cupertino_rounded_date_picker_widget.dart:922:24: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.

• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/C:/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  package:flutter/…/scheduler/binding.dart:1
  SchedulerBinding.instance!.addPostFrameCallback((Duration timestamp) {