mining co spaceship bug

[rambo]

medics do nothing and this error pops up

JobDriver threw exception in initAction. Pawn=Zebra, Job=TendPatient (Job_14931) A=Thing_Human674, Exception: System.NullReferenceException: Object reference not set to an instance of an object
  at Verse.AI.Toils_Haul+<CheckForGetOpportunityDuplicate>c__AnonStorey2.<>m__0 () [0x00000] in <filename unknown>:0
  at Verse.AI.JobDriver.TryActuallyStartNextToil () [0x00000] in <filename unknown>:0  lastJobGiver=Spaceship.JobGiver_HealColonists, curJob.def=TendPatient, curDriver=RimWorld.JobDriver_TendPatient
Verse.Log:Error(String)
Verse.AI.Pawn_JobTracker:StartErrorRecoverJob(String)
Verse.AI.JobDriver:TryActuallyStartNextToil()
Verse.AI.JobDriver:ReadyForNextToil()
Verse.AI.JobDriver:TryActuallyStartNextToil()
Verse.AI.JobDriver:ReadyForNextToil()
Verse.AI.JobDriver:Notify_PatherArrived()
Verse.AI.Pawn_PathFollower:PatherArrived()
Verse.AI.Pawn_PathFollower:StartPath(LocalTargetInfo, PathEndMode)
Verse.AI.<GotoThing>c__AnonStorey0:<>m__0()
Verse.AI.JobDriver:TryActuallyStartNextToil()
Verse.AI.JobDriver:ReadyForNextToil()
Verse.AI.JobDriver:TryActuallyStartNextToil()
Verse.AI.JobDriver:ReadyForNextToil()
Verse.AI.Pawn_JobTracker:StartJob(Job, JobCondition, ThinkNode, Boolean, Boolean, ThinkTreeDef, Nullable`1, Boolean)
Verse.AI.Pawn_JobTracker:TryFindAndStartJob()
Verse.AI.Pawn_JobTracker:EndCurrentJob_Patch1(Object, JobCondition, Boolean)
Verse.AI.Pawn_JobTracker:JobTrackerTick()
Verse.Pawn:Tick()
Verse.TickList:Tick()
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate()
Verse.Game:UpdatePlay()
Verse.Root_Play:Update()