Crashlytics reporting crash at ActivityHelper.java line 38 #657

I have the following crash report from Crashlytics

• Android device: __ XT320___
• Android OS version: 4.3.1_
• Google Play Services version: 10.2.0_
• Firebase/Play Services SDK version: _____
• FirebaseUI version: 1.2.0__

Step 3: Describe the problem:

Unknown. Please see crash report below

Steps to reproduce:

Unknown. Please see crash report below

Observed Results:

Please see the following Crashlytics report:

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android/com.firebase.ui.auth.ui.email.RegisterEmailActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
at dalvik.system.NativeStart.main(NativeStart.java)
Caused by java.lang.NullPointerException
at com.firebase.ui.auth.ui.ActivityHelper.configureTheme(ActivityHelper.java:38)
at com.firebase.ui.auth.ui.AppCompatBase.onCreate(AppCompatBase.java:27)
at com.firebase.ui.auth.ui.email.RegisterEmailActivity.onCreate(RegisterEmailActivity.java:59)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
at dalvik.system.NativeStart.main(NativeStart.java)

Expected Results:

Not crash

Relevant Code:

Here is the code we use to kick off the Auth:

AuthUI.IdpConfig facebookIdp = new AuthUI.IdpConfig.Builder(AuthUI.FACEBOOK_PROVIDER)
                            .setPermissions(Arrays.asList("email"))
                            .build();

// go to sign in to authenticate user
startActivityForResult(
                            AuthUI.getInstance()
                                    .createSignInIntentBuilder()
                                    .setProviders(Arrays.asList(
                                            new AuthUI.IdpConfig.Builder(AuthUI.EMAIL_PROVIDER).build(),
                                            new AuthUI.IdpConfig.Builder(AuthUI.GOOGLE_PROVIDER).build(),
                                            facebookIdp)
                                    )
                                    .setTosUrl("http://example.com/terms")
                                    .setIsSmartLockEnabled(false)
                                    .setTheme(R.style.ExampleSignInTheme)
                                    .setLogo(R.drawable.logo_example)
                                    .build(),
                            RC_SIGN_IN);

In case needed, here is the theme definition in xml:

    <style name="ExampleSignInTheme" parent="FirebaseUI">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
        <item name="android:windowFullscreen">true</item>
    </style>

I can see where in the library code the exception is thrown (ActivityHelper.java line 38) but I cannot see why it would happen. Any suggestions would be appreciated.

Thanks!