visitors actually

System.NullReferenceException: Object reference not set to an instance of an object
at Hospitality.LordToil_VisitPoint.Leave () [0x00000] in <filename unknown>:0
at Hospitality.LordToil_VisitPoint.Cleanup () [0x00000] in <filename unknown>:0
at Verse.AI.Group.Lord.GotoToil (Verse.AI.Group.LordToil newLordToil) [0x00000] in <filename unknown>:0
at Verse.AI.Group.Transition.Execute (Verse.AI.Group.Lord lord) [0x00000] in <filename unknown>:0
at Verse.AI.Group.Transition.CheckSignal (Verse.AI.Group.Lord lord, TriggerSignal signal) [0x00000] in <filename unknown>:0
at Verse.AI.Group.Lord.CheckTransitionOnSignal (TriggerSignal signal) [0x00000] in <filename unknown>:0
at Verse.AI.Group.Lord.LordTick () [0x00000] in <filename unknown>:0
at Verse.AI.Group.LordManager.LordManagerTick () [0x00000] in <filename unknown>:0
at Verse.Map.MapPostTick () [0x00000] in <filename unknown>:0
Verse.Log:Error(String)
Verse.Map:MapPostTick()
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate_Patch0(Object)
Verse.Game:UpdatePlay()
Verse.Root_Play:Update()

Having the same issue right now.

Using the Hospitality mod, i tried sending them away without buying anything and i didnt get spammed that they are leaving. After buying from them, and then sending away, the spam starts up. i didnt give them time to get in the base in either test.

Yeah, its a mod conflict with Hospitality mod.

The only known fix now is to use dev mod to delete away the entire visitor group