java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setBackgroundColor(int)' on a null object reference

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  • ListView.getChildAt().setBacgroundColor() crash
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    • java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setBackgroundColor(int)' on a null object reference at com.samo.facedatefb.SendMessage$2.onDataChange(SendMessage.java:265) 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$1.run(Unknown Source) at android.os.Handler.handleCallback(Handler.java:815) at android.os.Handler.dispatchMessage(Handler.java:104) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5549) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:964) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)
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