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Hmm, I'm guessing that it's unable to reflect JobGiver_GetRest.minCategory but why exactly that might be is beyond me, since this error doesn't appear during normal testing. Any other extenuating circumstances I should know about?

I figured out that my game was outdated hahaha.
Updated it and it is running great!

Nope, Just Psychology and HugsLib loaded, along Core, in this mod order:
Core
HugsLib
Psychology

Hai!
The ticking red error is the following:

Exception in Verse.AI.ThinkNode_PrioritySorter GetPriority: System.NullReferenceException: Object reference not set to an instance of an object
  at Psychology.Detour._JobGiver_GetRest.MinCategory (RimWorld.JobGiver_GetRest _this) [0x00000] in <filename unknown>:0
  at Psychology.Detour._JobGiver_GetRest._GetPriority (RimWorld.JobGiver_GetRest j, Verse.Pawn pawn) [0x00000] in <filename unknown>:0
  at Verse.AI.ThinkNode_PrioritySorter.TryIssueJobPackage (Verse.Pawn pawn) [0x0006c] in C:\Dev\RimWorld\Assets\Scripts\Verse\AI\ThinkNodes\ControlFlow\ThinkNode_Controls.cs:146
Verse.Log:Error(String) (at C:\Dev\RimWorld\Assets\Scripts\Verse\Utility\Debug\Log\Log.cs:48)
Verse.AI.ThinkNode_PrioritySorter:TryIssueJobPackage(Pawn) (at C:\Dev\RimWorld\Assets\Scripts\Verse\AI\ThinkNodes\ControlFlow\ThinkNode_Controls.cs:150)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage(Pawn) (at C:\Dev\RimWorld\Assets\Scripts\Verse\AI\ThinkNodes\ControlFlow\ThinkNode_Controls.cs:20)
Verse.AI.Pawn_JobTracker:DetermineNextJob(ThinkTreeDef&) (at C:\Dev\RimWorld\Assets\Scripts\Verse\AI\Pawn_JobTracker.cs:397)
Verse.AI.Pawn_JobTracker:TryFindAndStartJob() (at C:\Dev\RimWorld\Assets\Scripts\Verse\AI\Pawn_JobTracker.cs:339)
System.Reflection.MonoMethod:InternalInvoke(Object, Object[], Exception&)
System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
System.Reflection.MethodBase:Invoke(Object, Object[]) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
Psychology.Detour._Pawn_JobTracker:_EndCurrentJob(Pawn_JobTracker, JobCondition, Boolean)
Verse.AI.Pawn_JobTracker:JobTrackerTick() (at C:\Dev\RimWorld\Assets\Scripts\Verse\AI\Pawn_JobTracker.cs:89)
Verse.Pawn:Tick() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Pawn\Pawn.cs:403)
Verse.TickList:Tick() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Ticking\TickList.cs:130)
Verse.TickManager:DoSingleTick() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Ticking\TickManager.cs:273)
Verse.TickManager:TickManagerUpdate() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Ticking\TickManager.cs:243)
Verse.Game:Update() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Game\Game.cs:465)
Verse.Root_Play:Update() (at C:\Dev\RimWorld\Assets\Scripts\Verse\Global\Root\Root_Play.cs:73)