Crash when traveling from an area to the Ardura Caravan

My game has crashed 3 times when trying to travel to the ardura caravan, once from Lost City and the inner chamber, and again just now in valley of the titans. gives a popup saying "Attempted to resume curretn action with an invalid skill: 1073741824 object: Metadata/Monsters/EtchedBeetles/SmallEtchedBeetleArmoured@32"