mods/PLAYER/mcl_skins/edit_skin.lua

@@ -163,6 +163,8 @@ function mcl_skins.update_player_skin(player)
 	local skin = mcl_skins.player_skins[player]
 	local skinval = mcl_skins.compile_skin(skin)
 
+	if not skin.cape then skin.cape = "blank.png" end
+
 	if player:get_inventory():get_stack("armor", 3):get_name() == "mcl_armor:elytra" then
 		skinval = skinval:gsub("%^" .. skin.cape, "")
 		-- don't render the "normal" cape on players while wearing the elytra.