TypeError: Null check operator used on a null value

[jonjon1123]

Describe the bug
I have instrumented Sentry error reporting in my app. It is generating the following error often:

TypeError: Null check operator used on a null value
  split_config.arm64_v8a.apk0x703643d9e0 ShowcaseView._changeSequence.<T> (showcase_view.dart:432)
  split_config.arm64_v8a.apk0x70368e5bf4 _RootZone.runUnary (zone.dart:962)
  split_config.arm64_v8a.apk0x70368e5bf4 _FutureListener.handleValue (future_impl.dart:222)
  split_config.arm64_v8a.apk0x70368e5a78 Future._propagateToListeners.handleValueCallback (future_impl.dart:948)
  split_config.arm64_v8a.apk0x7036393d68 Future._propagateToListeners (future_impl.dart:977)
  split_config.arm64_v8a.apk0x7036394edc Future._completeWithValue (future_impl.dart:720)
  split_config.arm64_v8a.apk0x70368d82b4 _SuspendState._returnAsyncNotFuture (async_patch.dart:390)

To Reproduce
I am struggling to reproduce this on any devices I have, but I am getting fairly consistant error reports from Sentry.

Expected behavior
No errors should be reported.

Screenshots
N/A

Desktop (please complete the following information):
Desktop is not a supported platform for my app.

Smartphone (please complete the following information):

• Device: Multiple iOS and Android devices
• OS: Numerous versions of both iOS & Android
• Browser: N/A
• Version: 5.0.2

Additional context
N/A