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    java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.niloofar.showroom.BeaconsFragment.onScannerClosed()' on a null object reference
        at com.example.niloofar.showroom.BeaconScannerFragment.onCancel(BeaconScannerFragment.java:56)
        at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1260)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
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