The last few days I had several occasions of this kind: Exception handling event onVesselWasModified in class AutomatedScienceSampler:System.NullReferenceException: Object reference not set to an instance of an object at KerboKatz.ASS.AutomatedScienceSampler.GetCraftSettings () [0x00000] in <filename unknown>:0 at KerboKatz.ASS.AutomatedScienceSampler.OnVesselChange (.Vessel data) [0x00000] in <filename unknown>:0 at EventData`1[Vessel].Fire (.Vessel data) [0x00000] in &l