TypeError: Null check operator used on a null value

[sentry-io]

Sentry Issue: GLUT-ASSISTANT-N-3J

TypeError: Null check operator used on a null value
  File "framework.dart", line 1223, in State.setState
    _element!.markNeedsBuild();
  File "framework.dart", line 1163, in State.setState
    @protected
  File "function.dart", in _Closure.call
  File "dialog.dart", line 220, in codeCheckDialog._codeCheck._next
    fn(() {
  File "dialog.dart", line 235, in codeCheckDialog._codeCheck.<T>
    await codeCheck(textFieldController.text).then((String value) => _next(value));
...
(4 additional frame(s) were not displayed)

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