_FlutterPasswordStrengthState#61795(ticker active) was disposed with an active Ticker.

[iamriajul]

Steps to produce the error

When FlutterPasswordStrength widgets get hidden, this stack trace shows in logs.

Logs

`════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following assertion was thrown while finalizing the widget tree:
_FlutterPasswordStrengthState#61795(ticker active) was disposed with an active Ticker.

_FlutterPasswordStrengthState created a Ticker via its SingleTickerProviderStateMixin, but at the time dispose() was called on the mixin, that Ticker was still active. The Ticker must be disposed before calling super.dispose().

Tickers used by AnimationControllers should be disposed by calling dispose() on the AnimationController itself. Otherwise, the ticker will leak.

The offending ticker was: Ticker(created by _FlutterPasswordStrengthState#61795(lifecycle state: created))
The stack trace when the Ticker was actually created was:
#0 new Ticker. (package:flutter/src/scheduler/ticker.dart:66:40)
#1 new Ticker (package:flutter/src/scheduler/ticker.dart:68:6)
#2 SingleTickerProviderStateMixin.createTicker (package:flutter/src/widgets/ticker_provider.dart:129:15)
#3 new AnimationController (package:flutter/src/animation/animation_controller.dart:247:21)
#4 _FlutterPasswordStrengthState.initState (package:flutter_password_strength/flutter_password_strength.dart:133:9)
#5 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4640:58)
#6 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4476:5)
... Normal element mounting (10 frames)
#16 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3446:14)
#17 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5947:32)
... Normal element mounting (4 frames)
#21 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3446:14)
#22 Element.updateChild (package:flutter/src/widgets/framework.dart:3211:20)
#23 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4527:16)
#24 Element.rebuild (package:flutter/src/widgets/framework.dart:4218:5)
#25 StatelessElement.update (package:flutter/src/widgets/framework.dart:4583:5)
#26 Element.updateChild (package:flutter/src/widgets/framework.dart:3201:15)
#27 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4527:16)
#28 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4675:11)
#29 Element.rebuild (package:flutter/src/widgets/framework.dart:4218:5)
#30 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2627:33)
#31 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:883:20)
#32 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:284:5)
#33 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1113:15)
#34 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1052:9)
#35 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:968:5)
#39 _invoke (dart:ui/hooks.dart:261:10)
#40 _drawFrame (dart:ui/hooks.dart:219:3)
(elided 3 frames from dart:async)

When the exception was thrown, this was the stack:
#0 SingleTickerProviderStateMixin.dispose. (package:flutter/src/widgets/ticker_provider.dart:142:7)
#1 SingleTickerProviderStateMixin.dispose (package:flutter/src/widgets/ticker_provider.dart:156:6)
#2 _FlutterPasswordStrengthState.dispose (package:flutter_password_strength/flutter_password_strength.dart:172:11)
#3 StatefulElement.unmount (package:flutter/src/widgets/framework.dart:4729:12)
#4 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1922:13)
...
════════════════════════════════════════════════════════════════════════════════════════════════════`

[schillingdavid]

@JinHoSo My PR (PR #7) should solve this issue. Please look into it if you find some time to review. :)

[JinHoSo]

@schillingdavid Thank you :)