Root level exception in OnGUI(): System.NullReferenceException: Object reference not set to an instance of an object   at MoodBarPatch.MoodCache.DoIconVars (Verse.Pawn colonist) [0x000b5] in <c07db5954d0841a8b96bee2d07be7ae3>:0    at MoodBarPatch.MoodCache.Update (UnityEngine.Rect& rect, Verse.Pawn colonist, Verse.Map pawnMap, System.Boolean& reordering, RimWorld.ColonistBar colonistBar) [0x00217] in <c07db5954d0841a8b96bee2d07be7ae3>:0    at MoodBarPatch.MoodPatch.Prefix (RimWorld.ColonistBarColonistDrawer __instance, UnityEngine.Rect& rect, Verse.Pawn& colonist, Verse.Map& pawnMap, System.Boolean& highlight, System.Boolean& reordering) [0x00065] in <c07db5954d0841a8b96bee2d07be7ae3>:0    at (wrapper dynamic-method) RimWorld.ColonistBarColonistDrawer.RimWorld.ColonistBarColonistDrawer.DrawColonist_Patch2(RimWorld.ColonistBarColonistDrawer,UnityEngine.Rect,Verse.Pawn,Verse.Map,bool,bool)   at RimWorld.ColonistBar.ColonistBarOnGUI () [0x00135] in <d72310b4d8f64d25aee502792b58549f>:0    at (wrapper dynamic-method) RimWorld.MapInterface.RimWorld.MapInterface.MapInterfaceOnGUI_BeforeMainTabs_Patch2(RimWorld.MapInterface)   at RimWorld.UIRoot_Play.UIRootOnGUI () [0x0001f] in <d72310b4d8f64d25aee502792b58549f>:0    at (wrapper dynamic-method) Verse.Root.Verse.Root.OnGUI_Patch1(Verse.Root) Verse.Log:Error(String, Boolean) Verse.Root:Verse.Root.OnGUI_Patch1(Root)