Here is error message when clicking on pawn with RimHUD installed:
Root level exception in OnGUI(): System.NullReferenceException: Object reference not set to an instance of an object
at QualityColors.QualityColorsMod.AddColor2 (RimWorld.QualityCategory cat, System.String& __result) [0x00001] in <b799058dca484bbd95fd3801a692f3a7>:0
at (wrapper dynamic-method) RimWorld.QualityUtility.RimWorld.QualityUtility.GetLabel_Patch1(RimWorld.QualityCategory)
at RimWorld.GenLabel.NewThingLabel (Verse.Thing t, System.Int32 stackCount, System.Boolean includeHp) [0x00082] in <c36f9493c9844ddaa7fb5c788416098f>:0
at RimWorld.GenLabel.ThingLabel (Verse.Thing t, System.Int32 stackCount, System.Boolean includeHp) [0x000a2] in <c36f9493c9844ddaa7fb5c788416098f>:0
at Verse.Thing.get_LabelNoCount () [0x00000] in <c36f9493c9844ddaa7fb5c788416098f>:0
at Verse.ThingWithComps.get_LabelNoCount () [0x00000] in <c36f9493c9844ddaa7fb5c788416098f>:0
at Verse.Thing.get_Label () [0x00025] in <c36f9493c9844ddaa7fb5c788416098f>:0
at Verse.Thing.get_LabelCap () [0x00000] in <c36f9493c9844ddaa7fb5c788416098f>:0
at (wrapper dynamic-method) Verse.Pawn.Verse.Pawn.GetTooltip_Patch1(Verse.Pawn)
at (wrapper dynamic-method) Verse.TooltipGiverList.Verse.TooltipGiverList.DispenseAllThingTooltips_Patch1(Verse.TooltipGiverList)
at (wrapper dynamic-method) RimWorld.MapInterface.RimWorld.MapInterface.MapInterfaceOnGUI_BeforeMainTabs_Patch2(RimWorld.MapInterface)
at (wrapper dynamic-method) RimWorld.UIRoot_Play.RimWorld.UIRoot_Play.UIRootOnGUI_Patch1(RimWorld.UIRoot_Play)
at (wrapper dynamic-method) Verse.Root.Verse.Root.OnGUI_Patch1(Verse.Root)