Update update_icons.dm (#22853)

Author: JohnFulpWillard

code/modules/mob/living/carbon/update_icons.dm

@@ -175,7 +175,7 @@
 	if(!get_bodypart(BODY_ZONE_HEAD)) //Decapitated
 		return
 
-	if(client && hud_used?.inv_slots[TOBITSHIFT(ITEM_SLOT_BACK) + 1])
+	if(client && hud_used?.inv_slots[TOBITSHIFT(ITEM_SLOT_HEAD) + 1])
 		var/atom/movable/screen/inventory/inv = hud_used.inv_slots[TOBITSHIFT(ITEM_SLOT_HEAD) + 1]
 		inv.update_appearance(UPDATE_ICON)