java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException	at org.eclipse.smarthome.core.thing.internal.ThingManager.thingUpdated(ThingManager.java:542)[104:org.eclipse.smarthome.core.thing:0.9.0.201612221226]	at org.eclipse.smarthome.core.thing.internal.ThingRegistryImpl.notifyTrackers(ThingRegistryImpl.java:227)[104:org.eclipse.smarthome.core.thing:0.9.0.201612221226]	at org.eclipse.smarthome.core.thing.internal.ThingRegistryImpl.notifyListenersAboutUpdatedElement(ThingRegistryImpl.java:150)[104:org.eclipse.smarthome.core.thing:0.9.0.201612221226]