java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.internal.zzafg.zzg(com.google.android.gms.internal.zzafa, com.google.android.gms.internal.zzahu)' on a null object reference
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java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.internal.zzafg.zzg(com.google.android.gms.internal.zzafa, com.google.android.gms.internal.zzahu)' on a null object reference
at com.google.android.gms.internal.zzafc.zzb(Unknown Source)
at com.google.android.gms.internal.zzafc.zza(Unknown Source)
at com.google.android.gms.internal.zzafc.zzaO(Unknown Source)
at com.google.firebase.database.connection.idl.IPersistentConnectionImpl$3.zzaO(Unknown Source)
at com.google.firebase.database.connection.idl.zzi$zza.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:387)