Null check operator used on a null value

[maitycyrus]

`======== Exception caught by gesture ===============================================================
The following _CastError was thrown while handling a gesture:
Null check operator used on a null value

When the exception was thrown, this was the stack:
#0 _PersistentTabViewState.popAllScreens (package:persistent_bottom_nav_bar/persistent-tab-view.widget.dart:732:45)
#1 _PersistentTabViewState.navigationBarWidget. (package:persistent_bottom_nav_bar/persistent-tab-view.widget.dart:601:25)
#2 _BottomNavStyle12State.build.. (package:persistent_bottom_nav_bar/nav-bar-styles/style-12-bottom-nav-bar.widget.dart:177:59)
#3 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
#4 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
#5 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
#6 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:267:7)
#7 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
#8 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:443:20)
#9 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:419:22)
#10 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:322:11)
#11 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
#12 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
#13 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
#14 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
#18 _invoke1 (dart:ui/hooks.dart:170:10)
#19 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:331:7)
#20 _dispatchPointerDataPacket (dart:ui/hooks.dart:94:31)
(elided 3 frames from dart:async)
Handler: "onTap"
Recognizer: TapGestureRecognizer#a7603
debugOwner: GestureDetector
state: ready
won arena
finalPosition: Offset(184.0, 629.5)
finalLocalPosition: Offset(28.8, 19.1)
button: 1
sent tap down
=======================`

[maitycyrus]

_contextList is non-nullable

[alexaung]

How do you solve this issue? I am also facing it

[kubawich]

@maitycyrus Hey, how did You fix this?

[hortigado]

I have the same problem