java.lang.NullPointerExceptio: This exception has no message.

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java.lang.NullPointerExceptio:
at edusolution.matrimony.Chat$1.onDataChange(Chat.java:70)
at com.google.android.gms.internal.zzaie.zza(Unknown Source)
at com.google.android.gms.internal.zzaje.zzcta(Unknown Source)
at com.google.android.gms.internal.zzajh$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)

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