════════ Exception caught by animation library ═════════════════════════════════
The following assertion was thrown while notifying status listeners for AnimationController:
'package:flutter/src/widgets/overlay.dart': Failed assertion: line 1392 pos 14: '_zOrderIndex != null': is not true.
Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=2_bug.yml
When the exception was thrown, this was the stack:
#2 OverlayPortalController.hide (package:flutter/src/widgets/overlay.dart:1392:14)
overlay.dart:1392
#3 TooltipState._handleStatusChanged (package:flutter/src/material/tooltip.dart:442:28)
tooltip.dart:442
#4 AnimationLocalStatusListenersMixin.notifyStatusListeners (package:flutter/src/animation/listener_helpers.dart:240:19)
listener_helpers.dart:240
#5 AnimationController._checkStatusChanged (package:flutter/src/animation/animation_controller.dart:815:7)
animation_controller.dart:815
#6 AnimationController._tick (package:flutter/src/animation/animation_controller.dart:831:5)
animation_controller.dart:831
#7 Ticker._tick (package:flutter/src/scheduler/ticker.dart:249:12)
ticker.dart:249
#8 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325:15)
binding.dart:1325
#9 SchedulerBinding.handleBeginFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:1177:11)
binding.dart:1177
#10 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633:13)
compact_hash.dart:633
#11 SchedulerBinding.handleBeginFrame (package:flutter/src/scheduler/binding.dart:1175:17)
binding.dart:1175
#12 SchedulerBinding._handleBeginFrame (package:flutter/src/scheduler/binding.dart:1092:5)
binding.dart:1092
#13 _invoke1 (dart:ui/hooks.dart:328:13)
hooks.dart:328
#14 PlatformDispatcher._beginFrame (dart:ui/platform_dispatcher.dart:351:5)
platform_dispatcher.dart:351
#15 _beginFrame (dart:ui/hooks.dart:272:31)
hooks.dart:272
(elided 2 frames from class _AssertionError)
The AnimationController notifying status listeners was: AnimationController#7eab8(⏮ 0.000; paused)
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