NullPointerException AppCompatBase.java:32

[zjamshidi]

Describe your environment

• Android device: motorola Nexus 6
• Android OS version: 7.1.1
• Google Play Services version: _____
• Firebase/Play Services SDK version: 16.0.9
• FirebaseUI version: 5.0.0

Describe the problem:

I'm using firebase authentication on my android app and recently I got an email regarding significant number of crashes with this stack trace:
Caused by java.lang.NullPointerException: Attempt to read from field 'int com.firebase.ui.auth.a.a.d.c' on a null object reference
at com.firebase.ui.auth.ui.AppCompatBase.onCreate + 32(AppCompatBase.java:32)
at com.firebase.ui.auth.ui.email.EmailActivity.onCreate + 72(EmailActivity.java:72)

Relevant Code:

  @NonNull
  public Intent buildSignInIntent() {
      List<AuthUI.IdpConfig> selectedProviders = new ArrayList<>();
      selectedProviders.add(new AuthUI.IdpConfig.EmailBuilder().build());
      selectedProviders.add(new AuthUI.IdpConfig.FacebookBuilder().build());
      selectedProviders.add(new AuthUI.IdpConfig.GoogleBuilder().build());

      AuthUI.SignInIntentBuilder builder = AuthUI.getInstance().createSignInIntentBuilder()
              .setLogo(AuthUI.NO_LOGO)
              .setTheme(R.style.AppTheme)
              .setIsSmartLockEnabled(!BuildConfig.DEBUG /* credentials */, true /* hints */)
              .setAvailableProviders(selectedProviders)
              .enableAnonymousUsersAutoUpgrade();

      AuthMethodPickerLayout customLayout = new AuthMethodPickerLayout
              .Builder(R.layout.fragment_register)
              .setGoogleButtonId(R.id.custom_google_signin_button)
              .setEmailButtonId(R.id.custom_email_signin_button)
              .setFacebookButtonId(R.id.custom_facebook_signin_button)
              .setTosAndPrivacyPolicyId(R.id.custom_tos)
              .build();

      builder.setAuthMethodPickerLayout(customLayout);

      builder.setTosAndPrivacyPolicyUrls(Constants.TermsOfUseLink, Constants.PrivacyPolicyLink);

      return builder.build();
  }

How could I fix it? Thanks in advance.

[samtstern]

@zjamshidi the stack traces you have provided (mostly 'int com.firebase.ui.auth.a.a.d.c') are obfuscated which means it's basically impossible for us to debug this. Can you deobfuscate them using your proguard mapping file or try to reproduce it locally?

[zjamshidi]

Oh. Sorry. According to proguard mapping file

com.firebase.ui.auth.data.model.FlowParameters -> com.firebase.ui.auth.a.a.d:
    int themeId -> c

and the following is the full stack trace:

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.storyshots.android/com.firebase.ui.auth.ui.email.EmailActivity}: java.lang.NullPointerException: Attempt to read from field 'int com.firebase.ui.auth.a.a.d.c' on a null object reference
       at android.app.ActivityThread.performLaunchActivity + 2665(ActivityThread.java:2665)
       at android.app.ActivityThread.handleLaunchActivity + 2726(ActivityThread.java:2726)
       at android.app.ActivityThread.-wrap12(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage + 1477(ActivityThread.java:1477)
       at android.os.Handler.dispatchMessage + 102(Handler.java:102)
       at android.os.Looper.loop + 154(Looper.java:154)
       at android.app.ActivityThread.main + 6119(ActivityThread.java:6119)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run + 886(ZygoteInit.java:886)
       at com.android.internal.os.ZygoteInit.main + 776(ZygoteInit.java:776)
       at de.robv.android.xposed.XposedBridge.main + 107(XposedBridge.java:107)

[zjamshidi]

I have already found #765 which seems the same crash, but they solved the issue with updating the FirebaseUI Version to 1.2.0 while I'm using much newer version.

[samtstern]

@zjamshidi thanks for the deobfuscation. So somehow we're calling .themeId on a null instance of FlowParameters. I am not sure how this could be happening. Have you been able to reproduce this locally at all?

[zjamshidi]

So somehow we're calling .themeId on a null instance of FlowParameters.

Yes. It seems like this.

Have you been able to reproduce this locally at all?

No. I cannot reproduce it on my devices. But In Firebase Console I see 2 users are affected by this crash and I received an email that this issue's causing a significant number of crashes!

[palfonso]

Crashlytics is reporting same error for my app from some users.

Fatal Exception: java.lang.RuntimeException
Unable to start activity ComponentInfo{xxxxx.myapp/com.firebase.ui.auth.ui.idp.AuthMethodPickerActivity}: java.lang.NullPointerException: Attempt to read from field 'int com.firebase.ui.auth.data.model.FlowParameters.themeId' on a null object reference

Fatal Exception: java.lang.RuntimeException
Unable to start activity ComponentInfo{com.palfonsoft.match4app/com.firebase.ui.auth.ui.idp.AuthMethodPickerActivity}: java.lang.NullPointerException: Attempt to read from field 'int com.firebase.ui.auth.data.model.FlowParameters.themeId' on a null object reference

Was this issue solved ?

[palfonso]

Info about the device reporting the error:

Version: 6.0
Device: Y6II

[palfonso]

Using firebase-ui-auth:6.0.2

implementation 'com.firebaseui:firebase-ui-auth:6.0.2'

[palfonso]

Issue is clearly documented in stackoverflow:

https://stackoverflow.com/questions/59431114/attempt-to-read-from-field-int-com-firebase-ui-auth-data-model-flowparameters-t

[ranjan-malav]

Having a similar issue. A possible reason to why .themeId is called on null instance of FlowParameters is explained in #1729.