使用boost跳转，反复打开关闭flutter界面，会出现白屏崩溃

[yuyangkk]

1. boost原生跳转flutter
2. flutter返回到原生，使用boost返回
3. 反复重复上述操作

Flutter Boost Version v3.0-preview.6
Target Platform: iOS
Target OS version/browser: iOS13，14都会出现
Devices: iPhoneXR，iPhone 12 mini

Logs

Log1:
Assertion failed: (self.allContainers[uniqueId] != nil), function -[FBFlutterContainerManager activeContainer:forUniqueId:]

Log2:
2021-09-17 17:05:59.335534+0800 [4615:2053883] flutter: flutter log-->crash info:IOS:_AttentionAllPageState:NoSuchMethodError: The getter 'pageInfo' was called on null.
Receiver: null
Tried calling: pageInfo:#0 BoostLifecycleBinding.containerDidShow (package:flutter_boost/boost_lifecycle_binding.dart:41)
#1 FlutterBoostAppState.onContainerShow (package:flutter_boost/flutter_boost_app.dart:467)
#2 BoostFlutterRouterApi.onContainerShow (package:flutter_boost/boost_flutter_router_api.dart:46)
#3 FlutterRouterApi.setup. (package:flutter_boost/messages.dart:161)
#4 FlutterRouterApi.setup. (package:flutter_boost/messages.dart:158)
#5 BasicMessageChannel.setMessageHandler. (package:flutter/src/services/platform_channel.dart:73)
#6 BasicMessageChannel.setMessageHandler. (package:flutter/src/services/platform_channel.dart:72)
#7 _DefaultBinaryMessenger.handlePlatformMessage (package:flutter/src/services/binding.dart:284)
#8 _invoke3. (dart:ui/hooks.dart:221)
#9 _rootRun (dart:async/zone.dart:1354)
#10 _CustomZone.run (dart:async/zone.dart:1258)
#11 _CustomZone.runGuarded (dart:async/zone.dart:1162)
#12 _invoke3 (dart:ui/hooks.dart:220)
#13 PlatformDispatcher._dispatchPlatformMessage (dart:ui/platform_dispatcher.dart:457)
#14 _dispatchPlatformMessage (dart:ui/hooks.dart:90)
2021-09-17 17:05:59.364688+0800 qiangungun[4615:2053883] flutter: pause

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.0.4, on macOS 11.5.1 20G80 darwin-x64, locale
zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 2020.3)
[✓] VS Code (version 1.59.0)
[✓] Connected device (3 available)

[luckysmg]

preview.11上是否也有这个问题？