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java.lang.IllegalArgumentException: credential identifier cannot be empty	at Source)	at Source)	at$ Source)	at com.firebase.ui.auth.ui.account_link.SaveCredentialsActivity.onConnected(	at Source)	at Source)	at Source)	at Source)	at Source)	at Source)	at$1.onConnected(Unknown Source)	at$zzj.zztp(Unknown Source)	at$zza.zzc(Unknown Source)	at$zza.zzw(Unknown Source)	at$zze.zztr(Unknown Source)	at$zzd.handleMessage(Unknown Source)	at android.os.Handler.dispatchMessage(	at android.os.Looper.loop(	at	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(	at$	at