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This exception has no message.
java.lang.NullPointerException: 	at at.univie.sensorium.sensors.SensorValue.getValueRepresentation(SensorValue.java:85)	at at.univie.sensorium.SensorViewItem.updateDisplay(SensorViewItem.java:40)	at at.univie.sensorium.SensorViewItem.sensorUpdated(SensorViewItem.java:53)	at at.univie.sensorium.sensors.AbstractSensor.notifyListeners(AbstractSensor.java:167)	at at.univie.sensorium.sensors.RadioSensor$1.onServiceStateChanged(RadioSensor.java:111)	at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:360)	at android.os.Handler.dispatchMessage(Handler.java:99)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:4745)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)