Java.lang.NullPointerException в GoogleApiActivity

Я использую Crashlytics для своего приложения для Android, и у меня много сбоев в ActivityThread.java: android.app.ActivityThread.deliverResults

Я помещаю несколько следов стека здесь:

Fatal Exception: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=0, data=null} to activity {me.robano.android/com.google.android.gms.common.api.GoogleApiActivity}: java.lang.NullPointerException
       at android.app.ActivityThread.deliverResults(ActivityThread.java:3641)
       at android.app.ActivityThread.handleSendResult(ActivityThread.java:3684)
       at android.app.ActivityThread.access$1300(ActivityThread.java:166)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1331)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:136)
       at android.app.ActivityThread.main(ActivityThread.java:5584)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
       at dalvik.system.NativeStart.main(NativeStart.java)
Caused by java.lang.NullPointerException
       at com.google.android.gms.common.api.GoogleApiActivity.zza(Unknown Source)
       at com.google.android.gms.common.api.GoogleApiActivity.onActivityResult(Unknown Source)
       at android.app.Activity.dispatchActivityResult(Activity.java:5634)
       at android.app.ActivityThread.deliverResults(ActivityThread.java:3637)
       at android.app.ActivityThread.handleSendResult(ActivityThread.java:3684)
       at android.app.ActivityThread.access$1300(ActivityThread.java:166)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1331)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:136)
       at android.app.ActivityThread.main(ActivityThread.java:5584)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
       at dalvik.system.NativeStart.main(NativeStart.java)

Я также использую google firebase в своем приложении.

Пожалуйста, помогите! спасибо