Exception in RimWorld.ThinkNode_Priority_GetJoy TryIssueJobPackage: System.NullReferenceException: Object reference not set to an instance of an object
  at (wrapper dynamic-method) ColonistsDeco.JoyGiver_HangingWallDecoration.ColonistsDeco.JoyGiver_HangingWallDecoration.TryGiveJob_Patch0(ColonistsDeco.JoyGiver_HangingWallDecoration,Verse.Pawn)
  at RimWorld.JobGiver_GetJoy.TryGiveJobFromJoyGiverDefDirect (RimWorld.JoyGiverDef def, Verse.Pawn pawn) [0x00006] in <38562b1a2ab64eacb931fb5df05ca994>:0
  at (wrapper dynamic-method) RimWorld.JobGiver_GetJoy.RimWorld.JobGiver_GetJoy.TryGiveJob_Patch1(RimWorld.JobGiver_GetJoy,Verse.Pawn)
  at Verse.AI.ThinkNode_JobGiver.TryIssueJobPackage (Verse.Pawn pawn, Verse.AI.JobIssueParams jobParams) [0x00000] in <38562b1a2ab64eacb931fb5df05ca994>:0
  at Verse.AI.ThinkNode_Priority.TryIssueJobPackage (Verse.Pawn pawn, Verse.AI.JobIssueParams jobParams) [0x00022] in <38562b1a2ab64eacb931fb5df05ca994>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch3 (string)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.ThinkNode_PrioritySorter:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.ThinkNode_Tagger:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.ThinkNode_Subtree:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.ThinkNode_Conditional:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage (Verse.Pawn,Verse.AI.JobIssueParams)
Verse.AI.Pawn_JobTracker:DetermineNextJob (Verse.ThinkTreeDef&)
Verse.AI.Pawn_JobTracker:TryFindAndStartJob ()
(wrapper dynamic-method) Verse.AI.Pawn_JobTracker:Verse.AI.Pawn_JobTracker.EndCurrentJob_Patch5 (Verse.AI.Pawn_JobTracker,Verse.AI.JobCondition,bool,bool)
(wrapper dynamic-method) Verse.AI.Pawn_JobTracker:Verse.AI.Pawn_JobTracker.JobTrackerTick_Patch0 (Verse.AI.Pawn_JobTracker)
(wrapper dynamic-method) Verse.Pawn:Verse.Pawn.Tick_Patch3 (Verse.Pawn)
(wrapper dynamic-method) Verse.TickList:Verse.TickList.Tick_Patch2 (Verse.TickList)
(wrapper dynamic-method) Verse.TickManager:Verse.TickManager.DoSingleTick_Patch6 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) Verse.Game:Verse.Game.UpdatePlay_Patch1 (Verse.Game)
Verse.Root_Play:Update ()