Add Smacker bank note, Prevent Shop Banach-Tarski

craftitems.lua

@@ -35,6 +35,7 @@ end
 
 register_comm_currency("minegeld_1000_gabriel", "1000 MineGeld Note, Featuring Gabriel")
 register_comm_currency("minegeld_1000_nadine", "1000 MineGeld Note, Featuring Nadine")
+register_comm_currency("minegeld_1000_smacker", "1000 MineGeld Note, Featuring Smacker")
 register_comm_currency("minegeld_1000_och_noe", "1000 MineGeld Note, Featuring Och Nö")
 register_comm_currency("minegeld_1000_melinka", "1000 MineGeld Note, Featuring Melinka Town")
 register_comm_currency("minegeld_1000_mese_miracle", "1000 MineGeld Note, Featuring Mese Fairy Miracle")

shop.lua

@@ -195,13 +195,14 @@ minetest.register_on_player_receive_fields(function(sender, formname, fields)
 				end
 			end
 			if can_exchange then
+				local it
 				for i, item in pairs(wants) do
-					pinv:remove_item("customer_gives",item)
-					minv:add_item("customers_gave",item)
+					it = pinv:remove_item("customer_gives",item)
+					minv:add_item("customers_gave",it)
 				end
 				for i, item in pairs(gives) do
-					minv:remove_item("stock",item)
-					pinv:add_item("customer_gets",item)
+					it = minv:remove_item("stock",item)
+					pinv:add_item("customer_gets",it)
 				end
 				minetest.chat_send_player(name,S("Exchanged!"))
 			else