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Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference	at android.widget.ArrayAdapter$ArrayFilter.performFiltering(ArrayAdapter.java:480)	at android.widget.Filter$RequestHandler.handleMessage(Filter.java:234)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:135)	at android.os.HandlerThread.run(HandlerThread.java:61)