Hello! I get this error:

Error while generating pawn. Rethrowing. Exception: System.NullReferenceException: Object reference not set to an instance of an object.
at Immortals.ImmortalsHarmony.ChanceAddImmortal (Verse.Pawn pawn) [0x00086] in <466efa83590c4d469e4d25604e91d2a8>:0
at (wrapper dynamic-method) Verse.PawnGenerator.Verse.PawnGenerator.GenerateInitialHediffs_Patch1(Verse.Pawn,Verse.PawnGenerationRequest)
at (wrapper dynamic-method) Verse.PawnGenerator.Verse.PawnGenerator.TryGenerateNewPawnInternal_Patch3(Verse.PawnGenerationRequest&,string&,bool,bool)
at (wrapper dynamic-method) Verse.PawnGenerator.Verse.PawnGenerator.GenerateNewPawnInternal_Patch1(Verse.PawnGenerationRequest&)
at Verse.PawnGenerator.GenerateOrRedressPawnInternal (Verse.PawnGenerationRequest request) [0x00183] in <00638943358e4807bd44cd7bc8f572da>:0
at (wrapper dynamic-method) Verse.PawnGenerator.Verse.PawnGenerator.GeneratePawn_Patch4(Verse.PawnGenerationRequest)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
(wrapper dynamic-method) Verse.PawnGenerator:Verse.PawnGenerator.GeneratePawn_Patch4 (Verse.PawnGenerationRequest)
Verse.PawnGenerator:GeneratePawn (Verse.PawnKindDef,RimWorld.Faction)
(wrapper dynamic-method) RimWorld.WildAnimalSpawner:RimWorld.WildAnimalSpawner.SpawnRandomWildAnimalAt_Patch0 (RimWorld.WildAnimalSpawner,Verse.IntVec3)
RimWorld.WildAnimalSpawner:WildAnimalSpawnerTick ()
(wrapper dynamic-method) Verse.Map:Verse.Map.MapPostTick_Patch1 (Verse.Map)
(wrapper dynamic-method) Verse.TickManager:Verse.TickManager.DoSingleTick_Patch1 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
Verse.Game:UpdatePlay ()
Verse.Root_Play:Update ()