When working with yayo's animation it make the pawn invisibale after loading the game. error log is attached:

Exception drawing Casia: System.InvalidOperationException: Nullable object must have a value.
at System.Nullable`1[T].get_Value () [0x00008] in <eae584ce26bc40229c1b1aa476bfa589>:0
at RimWorld.Pawn_StoryTracker.get_SkinColorBase () [0x0005e] in <8c412d4a16f94d4cb337e846f2dee469>:0
at (wrapper dynamic-method) RimWorld.Pawn_StoryTracker.RimWorld.Pawn_StoryTracker.get_SkinColor_Patch1(RimWorld.Pawn_StoryTracker)
at AlienRace.HarmonyPatches.ResolveAllGraphicsPrefix (Verse.PawnGraphicSet __instance) [0x00234] in <16aebf7091a34f60b66c8ba608a224dd>:0
at (wrapper dynamic-method) Verse.PawnGraphicSet.Verse.PawnGraphicSet.ResolveAllGraphics_Patch6(Verse.PawnGraphicSet)
at (wrapper dynamic-method) Verse.PawnRenderer.Verse.PawnRenderer.RenderPawnAt_Patch8(Verse.PawnRenderer,UnityEngine.Vector3,System.Nullable`1<Verse.Rot4>,bool)
at Verse.Pawn_DrawTracker.DrawAt (UnityEngine.Vector3 loc) [0x00000] in <8c412d4a16f94d4cb337e846f2dee469>:0
at (wrapper dynamic-method) Verse.Pawn.Verse.Pawn.DrawAt_Patch1(Verse.Pawn,UnityEngine.Vector3,bool)
at Verse.Thing.Draw () [0x00015] in <8c412d4a16f94d4cb337e846f2dee469>:0
at Verse.ThingWithComps.Draw () [0x0000e] in <8c412d4a16f94d4cb337e846f2dee469>:0
at Verse.DynamicDrawManager.DrawDynamicThings () [0x000d8] in <8c412d4a16f94d4cb337e846f2dee469>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
Verse.DynamicDrawManager:DrawDynamicThings ()
(wrapper dynamic-method) Verse.Map:Verse.Map.MapUpdate_Patch3 (Verse.Map)
(wrapper dynamic-method) Verse.Game:Verse.Game.UpdatePlay_Patch2 (Verse.Game)
Verse.Root_Play:Update ()