App crash after a few seconds of usage

[domil96]

USER_COMMENT= ANDROID_VERSION=6.0.1 APP_VERSION_NAME=0.0.1 BRAND=samsung PHONE_MODEL=SM-G900F CUSTOM_DATA= STACK_TRACE=java.lang.NullPointerException: Attempt to invoke virtual method 'de.dmxcontrol.device.DeviceProperty$DevicePropertyValue[] de.dmxcontrol.device.EntityDevice.getGobos()' on a null object reference at de.dmxcontrol.adapter.GoboAdapter.getItems(GoboAdapter.java:91) at de.dmxcontrol.adapter.GoboAdapter.getCount(GoboAdapter.java:79) at android.widget.GridView.setAdapter(GridView.java:206) at de.dmxcontrol.fragment.GoboFragment.onCreateView(GoboFragment.java:48) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:844) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1053) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:622) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1371) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:418) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:158) at android.app.ActivityThread.main(ActivityThread.java:7224) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)