A TabController was used after being disposed.

[tonnyavery]

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I am trying to rebuild my tabController depending on some feature flags being on or off.

final featureFlags = useState(database.getFeatureFlags());
database.featureFlagsBox.watch(key: "feature_flags").listen((event) {
      featureFlags.value = event.value;
    });
final allPages = useMemoized(() {
      return _buildPages(featureFlags.value);
    }, [featureFlags.value]);
final _ticker = useSingleTickerProvider();
final _tabController = useTabController(initialLength: allPages.length, vsync: _ticker, keys: [featureFlags.value]);

Doing that results in and error:

The following assertion was thrown building CollectionsPage(dirty, dependencies: [_EffectiveTickerMode, _LocalizationsScope-[GlobalKey#13ef1], _InheritedTheme], useState<FeatureFlags>: Instance of 'FeatureFlags', useMemoized<List<PageViewDescription>>: [Instance of 'PageViewDescription'], useSingleTickerProvider):
A TabController was used after being disposed.

Once you have called dispose() on a TabController, it can no longer be used.
The relevant error-causing widget was: 
  CollectionsPage .../lib/components/screens/home/HomeScreen.dart:44:67
When the exception was thrown, this was the stack: 
#0      ChangeNotifier._debugAssertNotDisposed.<anonymous closure> (package:flutter/src/foundation/change_notifier.dart:117:9)
#1      ChangeNotifier._debugAssertNotDisposed (package:flutter/src/foundation/change_notifier.dart:123:6)
#2      ChangeNotifier.dispose (package:flutter/src/foundation/change_notifier.dart:212:12)
#3      TabController.dispose (package:flutter/src/material/tab_controller.dart:299:11)
#4      _TabControllerHookState.dispose (package:flutter_hooks/src/tab_controller.dart:57:33)

Probably related to https://github.com/rrousselGit/flutter_hooks/issues/81

[rrousselGit]

Sorry for the late reply. Could you share a complete snippet and steps to reproduce the problem?

The code you gave isn't enough to reproduce it.

[tonnyavery]

Wow, ok, this was a long time ago =) I have either found a fix or a workaround, or removed flags. I will try to dig into my code to find some details.

[rrousselGit]

Haha thanks!