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    java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.firebase.database.DatabaseReference.removeEventListener(com.google.firebase.database.ChildEventListener)' on a null object reference
        at com.google.cloud.solutions.flexenv.PlayActivity$4.onResult(PlayActivity.java:243)
        at com.google.cloud.solutions.flexenv.PlayActivity$4.onResult(PlayActivity.java:240)
        at com.google.android.gms.internal.zznv$zza.zzb(Unknown Source)
        at com.google.android.gms.internal.zznv$zza.handleMessage(Unknown Source)
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