rimworld deep and deeper

JobDriver threw exception in toil null's initAction for pawn Joe driver=JobDriver_EnterPortal (toilIndex=2)
System.NullReferenceException: Object reference not set to an instance of an object
[Ref 276850D9]
  at RimWorld.MapPortal.OnEntered (Verse.Pawn pawn) [0x000c0] in <981a33edf24d499488b0f820d94638e1>:0
  at Shashlichnik.CaveEntrance.OnEntered (Verse.Pawn pawn) [0x00000] in <3a0be9cef7cf4eaab881374abe1038e1>:0
  at RimWorld.JobDriver_EnterPortal.<MakeNewToils>b__5_1 () [0x000c7] in <981a33edf24d499488b0f820d94638e1>:0
  at Verse.AI.JobDriver.TryActuallyStartNextToil () [0x001b0] in <981a33edf24d499488b0f820d94638e1>:0
enable table
JobDriver threw exception in toil null's initAction for pawn Connor driver=JobDriver_EnterPortal (toilIndex=2)
System.NullReferenceException: Object reference not set to an instance of an object
[Ref DA3B213D]
  at RimWorld.MapPortal.OnEntered (Verse.Pawn pawn) [0x000c0] in <981a33edf24d499488b0f820d94638e1>:0
  at Shashlichnik.CaveExit.OnEntered (Verse.Pawn pawn) [0x00000] in <3a0be9cef7cf4eaab881374abe1038e1>:0
  at RimWorld.JobDriver_EnterPortal.<MakeNewToils>b__5_1 () [0x000c7] in <981a33edf24d499488b0f820d94638e1>:0
  at Verse.AI.JobDriver.TryActuallyStartNextToil () [0x001b0] in <981a33edf24d499488b0f820d94638e1>:0
JobDriver threw exception in toil null's initAction for pawn Joe driver=JobDriver_EnterPortal (toilIndex=2)
System.NullReferenceException: Object reference not set to an instance of an object
[Ref DA3B213D] Duplicate stacktrace, see ref for original