I was going to put in the comments, but since I need to paste a hell of a code, I will put here.

One of my pawns, Vol, tried to snap out another one, Fox, and failed. After that I keep receiving this erros message even so Fox already recovered by itself:


Vol threw exception in WorkGiver SnapOut_CalmPawnDownWorkgiver: System.NullReferenceException: Object reference not set to an instance of an object
at SnapOut.SnapUtils.CanDo (Verse.Pawn) <0x000c0>
at SnapOut.WorkGiver_CalmPawnDown.JobOnThing (Verse.Pawn,Verse.Thing,bool) <0x0021e>
at RimWorld.WorkGiver_Scanner.HasJobOnThing (Verse.Pawn,Verse.Thing,bool) <0x00031>
at RimWorld.JobGiver_Work/<TryIssueJobPackage>c__AnonStorey1.<>m__0 (Verse.Thing) <0x0005e>
at Verse.GenClosest/<ClosestThingReachable>c__AnonStorey0.<>m__0 (Verse.Thing) <0x000fa>
at Verse.GenClosest.ClosestThing_Global (Verse.IntVec3,System.Collections.IEnumerable,single,System.Predicate`1<Verse.Thing>,System.Func`2<Verse.Thing, single>) <0x00214>
at Verse.GenClosest.ClosestThingReachable (Verse.IntVec3,Verse.Map,Verse.ThingRequest,Verse.AI.PathEndMode,Verse.TraverseParms,single,System.Predicate`1<Verse.Thing>,System.Collections.Generic.IEnumerable`1<Verse.Thing>,int,int,bool,Verse.RegionType,bool) <0x00505>
at (wrapper dynamic-method) RimWorld.JobGiver_Work.TryIssueJobPackage_Patch1 (object,Verse.Pawn,Verse.AI.JobIssueParams) <0x0131f>

Verse.Log:Error(String, Boolean)
RimWorld.JobGiver_Work:TryIssueJobPackage_Patch1(Object, Pawn, JobIssueParams)
Verse.AI.ThinkNode_PrioritySorter:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_Tagger:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_Subtree:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_Conditional:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.Pawn_JobTracker:DetermineNextJob_Patch4(Object, ThinkTreeDef&)
Verse.AI.Pawn_JobTracker:TryFindAndStartJob()
Verse.AI.Pawn_JobTracker:EndCurrentJob_Patch2(Object, JobCondition, Boolean)
Verse.AI.Pawn_JobTracker:JobTrackerTick()
Verse.Pawn:Tick_Patch1(Object)
Verse.TickList:Tick()
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate()
Verse.Game:UpdatePlay()
Verse.Root_Play:Update()