[problem with VisibilityDetector?] Bad state: No ProviderScope found. Error thrown during a task callback.

[peterweb2005]

only found in crash report, which i cant reproduce

error log

Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Bad state: No ProviderScope found. Error thrown during a task callback.
at ProviderScope.containerOf(framework.dart:107)
at ConsumerStatefulElement.read(consumer.dart:613)
at _ListHeaderWidget.build.(xx_page.dart:278)
at VisibilityDetectorLayer._fireCallback(visibility_detector_layer.dart:263)
at VisibilityDetectorLayer._processCallbacks(visibility_detector_layer.dart:222)
at _TaskEntry.run(binding.dart:92)
at SchedulerBinding.handleEventLoopCallback(binding.dart:515)
at SchedulerBinding._runTasks(binding.dart:490)
at TickerFuture.whenCompleteOrCancel.thunk(ticker.dart:420)

purpose of this code is to detect if the progress view container is visible, which this view is in a "list header"
else show center progress view

              // consume progress
              SizedBox(
                width: 24,
                height: 24,
                child: VisibilityDetector(
                  key: _progressViewVisiblityKey,
                  onVisibilityChanged: (VisibilityInfo visibilityInfo) {
                    log.finest('visibilityInfo: ', visibilityInfo);
                    final visible = visibilityInfo.visibleBounds != Rect.zero;
                    log.finest('visible: ', visible);
                    ref.read(progressViewVisibleProvider.notifier).state =
                        visible;
                  },
                  child: Consumer(builder: (context, ref, child) {
                    final progress =
                        ref.watch(requestProvider.select((e) => e.progress));
                    log.finest('progress: ', progress);
                    if (progress) {
                      final visible = ref.watch(progressViewVisibleProvider);
                      log.finest('visible: ', visible);
                      if (visible) {
                        return CircularProgressIndicator(
                            valueColor: AlwaysStoppedAnimation(
                                StyleUtil.getColorScheme().fg1));
                      }
                    }
                    return Container();
                  }),
                ),
              ),

[peterweb2005]

(as revision) it is a view in slivers of CustomScrollView, is it disposed? so no scope?

EDITED
as #1346?

EDITED
published to see

EDITED

Revision

i found that it is not a item in list view, it is a view in slivers of CustomScrollView

CustomScrollView(
          controller: scrollController,
          // cacheExtent: 3000,
          slivers: [
            // list head
            SliverToBoxAdapter(child: _buildListItem(item, 0)),
            // list view ...

[rrousselGit]

if your widget got disposed, ref.read will throw, yes.

[rrousselGit]

It's similar to how using BuildContext throws on unmounted widgets

[peterweb2005]

no crash log,
but sorry, i think still need to notify the change event (as it really happened), otherwise lost

EDIT
trying useEffect() hook to listen dispose event

[peterweb2005]

Sorry, forgot to tell how I resolved

1. keep notifier on init
2. on dispose, use that notifier, so no need the ref