System.NullReferenceException: Object reference not set to an instance of an object
at RimWorld.PartyUtility.AcceptableGameConditionsToContinueParty (Verse.Map map) [0x00000] in <filename unknown>:0
at RimWorld.PartyUtility.AcceptableGameConditionsToStartParty (Verse.Map map) [0x00000] in <filename unknown>:0
at Psychology.Hediff_PlannedDate.Tick () [0x00000] in <filename unknown>:0
at Verse.Pawn_HealthTracker.HealthTick () [0x00000] in <filename unknown>:0
at Verse.Pawn.Tick () [0x00000] in <filename unknown>:0
at RimWorld.Planet.WorldPawns.WorldPawnsTick () [0x00000] in <filename unknown>:0
at RimWorld.Planet.World.WorldTick () [0x00000] in <filename unknown>:0
at Verse.TickManager.DoSingleTick () [0x00000] in <filename unknown>:0
Verse.Log:Error(String)
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate()
Verse.Game:UpdatePlay()
Verse.Root_Play:Update()
Possible related log: