diff --git a/trade/trade.lua b/trade/trade.lua
index 56b814f..6526b9b 100644
--- a/trade/trade.lua
+++ b/trade/trade.lua
@@ -173,7 +173,8 @@ function npc.trade.show_trade_offer_formspec(self, player, offer_type)
         prompt_string = " wants to sell to you"
         buy_sell_string = "Buy"
     end
-
+	
+	if trade_offer.item ~= nil then
     local formspec = "size[8,4]"..
             default.gui_bg..
             default.gui_bg_img..
@@ -192,6 +193,7 @@ function npc.trade.show_trade_offer_formspec(self, player, offer_type)
     }
     -- Show formspec to player
     minetest.show_formspec(player:get_player_name(), "advanced_npc:trade_offer", formspec)
+	end
 end