As a heads-up: with the 1.1.1 update that just landed, I now get this when I call vessel.GetActiveResources() (with a valid vessel): [EXC 16:19:20.651] NullReferenceException: Object reference not set to an instance of an object Vessel.GetActiveResources () JSI.RPMVesselComputer.FetchPerPartData () JSI.RPMVesselComputer.UpdateVariables () JSI.RPMVesselComputer.FixedUpdate () EDIT: Actually Vessel.GetActiveResource throws an exception, too.  I'll have to wrap these in try/catch blocks