🐛 [firebase_ui_auth] Null check operator used on a null value at EmailVerificationController.user(email_verification.dart:68)

## Bug report

**Describe the bug**
Getting a null check operator error when user registers for the first time and is then sent to email verification screen, waiting to verify their email. When the error occurs I get a varied response from the UI sometimes a blank screen, pressing back brings them back to login screen.

### Steps to reproduce

Steps to reproduce the behavior:

1. Register new account using Firebase UI
2. Email verification screen shown

### Expected behavior

Continue waiting for user to verify email

### Sample project
This is what I use for my registration screen:

```dart
class LoginScreen extends StatelessWidget {
  const LoginScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Material(
      child: SignInScreen(
        providers: providers,
        actions: [
          ForgotPasswordAction(
            (context, email) {
              Navigator.push(
                context,
                forgotPass(email),
              );
            },
          ),
          AuthStateChangeAction<SignedIn>((context, state) {
            if (state.user!.emailVerified) {
              Navigator.pushReplacementNamed(context, '/admin');
            } else {
              Navigator.push(context, verifyEmail());
            }
          }),
          AuthStateChangeAction<UserCreated>((context, state) {
            Navigator.push(context, verifyEmail());
          })
        ],
      ),
    );
    // );; //signScreen();
  }

    MaterialPageRoute<dynamic> verifyEmail() {
    return MaterialPageRoute(
      builder: (context) => EmailVerificationScreen(
        headerBuilder: headerIcon(Icons.mark_email_unread),
        sideBuilder: sideIcon(Icons.mark_email_unread),
        actions: [
          EmailVerifiedAction(() {
            Navigator.pushReplacementNamed(context, '/login');
          }),
          AuthCancelledAction((context) {
            FirebaseUIAuth.signOut(context: context);
            Navigator.pop(context);
          }),
        ],
      ),
    );
  }

  MaterialPageRoute<dynamic> forgotPass(String? email) {
    return MaterialPageRoute(
      builder: (context) => ForgotPasswordScreen(
        headerBuilder: headerIcon(Icons.lock),
        sideBuilder: sideIcon(Icons.lock),
        email: email,
      ),
    );
  }
}
```

---

## Additional context

Error Details:

```bash
Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value
       at EmailVerificationController.user(email_verification.dart:68)
       at EmailVerificationController.reload(email_verification.dart:82)
       at EmailVerificationController.didChangeAppLifecycleState(email_verification.dart:63)
       at WidgetsBinding.handleAppLifecycleStateChanged(binding.dart:713)
       at ServicesBinding._handleLifecycleMessage(binding.dart:261)
       at BasicMessageChannel.setMessageHandler.<fn>(platform_channel.dart:212)
       at _DefaultBinaryMessenger.setMessageHandler.<fn>(binding.dart:479)

ReferenceQueueDaemon:
       at java.lang.Object.wait(Object.java)
       at java.lang.Object.wait(Object.java:442)
       at java.lang.Object.wait(Object.java:568)
       at java.lang.Daemons$ReferenceQueueDaemon.runInternal(Daemons.java:232)
       at java.lang.Daemons$Daemon.run(Daemons.java:140)
       at java.lang.Thread.run(Thread.java:1012)

OkHttp ConnectionPool:
       at java.lang.Object.wait(Object.java)
       at com.android.okhttp.ConnectionPool$1.run(ConnectionPool.java:106)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at java.lang.Thread.run(Thread.java:1012)

pool-7-thread-1:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
       at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
       at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1063)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at java.lang.Thread.run(Thread.java:1012)

Firebase Background Thread firebase/flutterfire#2:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
       at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
       at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1063)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at com.google.firebase.concurrent.b.b(:12)
       at com.google.firebase.concurrent.b.a()
       at com.google.firebase.concurrent.a.run(:4)
       at java.lang.Thread.run(Thread.java:1012)

awaitEvenIfOnMainThread task continuation executor1:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
       at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
       at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1063)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at g1.x$a$a.a(:2)
       at g1.d.run(:5)
       at java.lang.Thread.run(Thread.java:1012)

queued-work-looper:
       at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
       at android.os.MessageQueue.next(MessageQueue.java:335)
       at android.os.Looper.loopOnce(Looper.java:186)
       at android.os.Looper.loop(Looper.java:313)
       at android.os.HandlerThread.run(HandlerThread.java:67)

main:
       at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
       at android.os.MessageQueue.next(MessageQueue.java:335)
       at android.os.Looper.loopOnce(Looper.java:186)
       at android.os.Looper.loop(Looper.java:313)
       at android.app.ActivityThread.main(ActivityThread.java:8757)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)

Firebase Background Thread firebase/flutterfire#3:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
       at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
       at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1063)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at com.google.firebase.concurrent.b.b(:12)
       at com.google.firebase.concurrent.b.a()
       at com.google.firebase.concurrent.a.run(:4)
       at java.lang.Thread.run(Thread.java:1012)

DefaultDispatcher-worker-3:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:357)
       at kotlinx.coroutines.scheduling.a$c.l(:23)
       at kotlinx.coroutines.scheduling.a$c.r(:48)
       at kotlinx.coroutines.scheduling.a$c.n(:60)
       at kotlinx.coroutines.scheduling.a$c.run()

com.google.firebase.crashlytics.startup1:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
       at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
       at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1063)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at g1.x$a$a.a(:2)
       at g1.d.run(:5)
       at java.lang.Thread.run(Thread.java:1012)

FinalizerWatchdogDaemon:
       at java.lang.Thread.sleep(Thread.java)
       at java.lang.Thread.sleep(Thread.java:450)
       at java.lang.Thread.sleep(Thread.java:355)
       at java.lang.Daemons$FinalizerWatchdogDaemon.sleepForNanos(Daemons.java:438)
       at java.lang.Daemons$FinalizerWatchdogDaemon.waitForProgress(Daemons.java:480)
       at java.lang.Daemons$FinalizerWatchdogDaemon.runInternal(Daemons.java:369)
       at java.lang.Daemons$Daemon.run(Daemons.java:140)
       at java.lang.Thread.run(Thread.java:1012)

DefaultDispatcher-worker-2:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:357)
       at kotlinx.coroutines.scheduling.a$c.l(:23)
       at kotlinx.coroutines.scheduling.a$c.r(:48)
       at kotlinx.coroutines.scheduling.a$c.n(:60)
       at kotlinx.coroutines.scheduling.a$c.run()

Firebase Background Thread firebase/flutterfire#1:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
       at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
       at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1063)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at com.google.firebase.concurrent.b.b(:12)
       at com.google.firebase.concurrent.b.a()
       at com.google.firebase.concurrent.a.run(:4)
       at java.lang.Thread.run(Thread.java:1012)

Crashlytics Exception Handler1:
       at dalvik.system.VMStack.getThreadStackTrace(VMStack.java)
       at java.lang.Thread.getStackTrace(Thread.java:1841)
       at java.lang.Thread.getAllStackTraces(Thread.java:1909)
       at g1.r.y(:16)
       at g1.r.o(:4)
       at g1.r.j(:45)
       at g1.r.d(:44)
       at g1.h0.r(:19)
       at g1.h0.s(:32)
       at g1.n$b.a(:49)
       at g1.n$b.call()
       at g1.k$c.then(:2)
       at com.google.android.gms.tasks.zze.run(:8)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1137)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at g1.x$a$a.a(:2)
       at g1.d.run(:5)
       at java.lang.Thread.run(Thread.java:1012)

FinalizerDaemon:
       at java.lang.Object.wait(Object.java)
       at java.lang.Object.wait(Object.java:442)
       at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:203)
       at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:224)
       at java.lang.Daemons$FinalizerDaemon.runInternal(Daemons.java:300)
       at java.lang.Daemons$Daemon.run(Daemons.java:140)
       at java.lang.Thread.run(Thread.java:1012)

TokenRefresher:
       at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
       at android.os.MessageQueue.next(MessageQueue.java:335)
       at android.os.Looper.loopOnce(Looper.java:186)
       at android.os.Looper.loop(Looper.java:313)
       at android.os.HandlerThread.run(HandlerThread.java:67)

DefaultDispatcher-worker-1:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:357)
       at kotlinx.coroutines.scheduling.a$c.l(:23)
       at kotlinx.coroutines.scheduling.a$c.r(:48)
       at kotlinx.coroutines.scheduling.a$c.n(:60)
       at kotlinx.coroutines.scheduling.a$c.run()

Firebase Background Thread #0:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
       at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
       at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:433)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1063)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at com.google.firebase.concurrent.b.b(:12)
       at com.google.firebase.concurrent.b.a()
       at com.google.firebase.concurrent.a.run(:4)
       at java.lang.Thread.run(Thread.java:1012)

Okio Watchdog:
       at java.lang.Object.wait(Object.java)
       at java.lang.Object.wait(Object.java:442)
       at java.lang.Object.wait(Object.java:568)
       at com.android.okhttp.okio.AsyncTimeout.awaitTimeout(AsyncTimeout.java:313)
       at com.android.okhttp.okio.AsyncTimeout.access$000(AsyncTimeout.java:42)
       at com.android.okhttp.okio.AsyncTimeout$Watchdog.run(AsyncTimeout.java:288)

Firebase Blocking Thread firebase/flutterfire#1:
       at jdk.internal.misc.Unsafe.park(Unsafe.java)
       at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:234)
       at java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:463)
       at java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:361)
       at java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:939)
       at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1062)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1123)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:637)
       at com.google.firebase.concurrent.b.b(:12)
       at com.google.firebase.concurrent.b.a()
       at com.google.firebase.concurrent.a.run(:4)
       at java.lang.Thread.run(Thread.java:1012)

```

---

### Flutter doctor

Run `flutter doctor` and paste the output below:

<details><summary>Click To Expand</summary>

```
[√] Flutter (Channel stable, 3.10.6, on Microsoft Windows [Version 10.0.22621.1992], locale en-GB)
    • Flutter version 3.10.6 on channel stable at C:\Development\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision f468f3366c (3 weeks ago), 2023-07-12 15:19:05 -0700
    • Engine revision cdbeda788a
    • Dart version 3.0.6
    • DevTools version 2.23.1

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
    • Android SDK at C:\Development
    • Platform android-33, build-tools 33.0.2
    • ANDROID_HOME = C:\Development
    • ANDROID_SDK_ROOT = C:\Development\tools
    • Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-b2043.56-9586694)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 2022.2)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-b2043.56-9586694)

[√] VS Code (version 1.80.0)
    • VS Code at ~\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.68.0

[√] Connected device (3 available)
    • VOG L09 (mobile) • 192.168.1.165:5555 • android-arm64  • Android 10 (API 29)
    • Chrome (web)     • chrome             • web-javascript • Google Chrome 115.0.5790.110
    • Edge (web)       • edge               • web-javascript • Microsoft Edge 115.0.1901.188

[√] Network resources
    • All expected network resources are available.

• No issues found!
```

</details>

---

### Flutter dependencies

Run `flutter pub deps -- --style=compact` and paste the output below:

<details><summary>Click To Expand</summary>

```
PASTE OUTPUT INSIDE HERE
```

</details>

---


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🐛 [firebase_ui_auth] Null check operator used on a null value at EmailVerificationController.user(email_verification.dart:68) #9

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🐛 [firebase_ui_auth] Null check operator used on a null value at EmailVerificationController.user(email_verification.dart:68) #9

Description

Bug report

Steps to reproduce

Expected behavior

Sample project

Additional context

Flutter doctor

Flutter dependencies

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions