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)	at org.eclipse.smarthome.core.thing.internal.ThingRegistryImpl.notifyTrackers(ThingRegistryImpl.java:227)	at org.eclipse.smarthome.core.thing.internal.ThingRegistryImpl.notifyListenersAboutUpdatedElement(ThingRegistryImpl.java:150)