Happens when using the android client to join a study held by aware micro server

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2020-05-22 16:11:34.846 26899-26932/com.aware.phone E/AndroidRuntime: FATAL EXCEPTION: AWARE::Accelerometer
Process: com.aware.phone, PID: 26899
java.lang.NullPointerException: Attempt to invoke interface method 'void com.aware.Websocket$AWARESensorObserver.sendMessage(java.lang.String)' on a null object reference
at com.aware.Accelerometer.onSensorChanged(Accelerometer.java:153)
at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:835)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:326)
at android.os.Looper.loop(Looper.java:165)
at android.os.HandlerThread.run(HandlerThread.java:65)