flutter go_router不良状态：刷新后可依赖的肘发射状态时没有元素

Question

有3个Cubit流合并为一个。

GoRouter _router = GoRouter(
refreshListenable: GoRouterRefreshStream(StreamGroup.merge(
  [
    GetIt.I<AuthBloc>().stream,
    GetIt.I<SignUpFormCubit>().stream,
    GetIt.I<SignInFormCubit>().stream,
  ],
)),
// redirect to the login page if the user is not logged in
redirect: (state) {
  // if the user is not logged in, they need to login
  final loggedIn = GetIt.I<FirebaseAuth>().currentUser != null;
  final loggingIn = (state.subloc == Routes.auth ||
      state.subloc == Routes.signUp ||
      state.subloc == Routes.signIn);
  // if (!loggedIn) return loggingIn ? null : Routes.auth;
  // todo delete
  if (!loggedIn) return loggingIn ? null : Routes.auth;

  // if the user is logged in but still on the login page, send them to
  // the home page
  if (loggingIn) return Routes.home;

  // no need to redirect at all
  return null;
},
routes: <GoRoute>[
  GoRoute(
    path: Routes.home,
    builder: (context, GoRouterState state) => InitialPage(),
  ),
  GoRoute(
    path: Routes.auth,
    builder: (context, GoRouterState state) => AuthPage(),
  ),
  GoRoute(
    path: Routes.signUp,
    builder: (context, GoRouterState state) => SignUpPage(),
  ),
  GoRoute(
    path: Routes.signIn,
    builder: (context, GoRouterState state) => SignInPage(),
  ),
],
);

从 auth 路线可以转移到路线中的符号：

context.push(Routes.signIn);

从中返回 auth 路线

一直按预期工作，直到Cubit散发出某种状态为止。

signInformCubit （看一下刷新的可刷新）每次有验证错误时都会发出状态，例如邮件不正确。

问题在于，当任何状态发出后，按钮停止按预期工作：

The following StateError was thrown building Builder(dirty):
Bad state: No element

The relevant error-causing widget was: 
  Spacing Spacing:file:///Users/sergiyvergun/IdeaProjects/Fleengo/lib/app/core.dart:160:16
When the exception was thrown, this was the stack: 
#0      List.last (dart:core-patch/growable_array.dart:365:5)
#1      GoRouterDelegate.location (package:go_router/src/go_router_delegate.dart:192:32)
#2      GoRouterDelegate._builder (package:go_router/src/go_router_delegate.dart:647:33)
#3      GoRouterDelegate.build (package:go_router/src/go_router_delegate.dart:215:41)
#4      Builder.build (package:flutter/src/widgets/basic.dart:7398:48)
#5      StatelessElement.build (package:flutter/src/widgets/framework.dart:4827:28)
#6      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4754:15)
#7      Element.rebuild (package:flutter/src/widgets/framework.dart:4477:5)

如何解决此问题？

Answer 1

我遇到了不良状态的同样问题：没有元素。我的问题是在基本或主路线上使用“重定向”参数。当我从求解的基本路线上删除“重定向”参数时。

但是这个东西没有任何地方