Skip item for sellmenu if item isn't in shared

Adds an item check before creating the sellmenu as to avoid errors

shared/shops.lua

@@ -30,6 +30,7 @@ function sellMenu(data)
         for k, v in pairs(data.sellTable.Items) do itemList[k] = 1 end
         local _, hasTable = hasItem(itemList)
         for k, v in pairsByKeys(data.sellTable.Items) do
+            if Items[k] then
                 Menu[#Menu + 1] = {
                     isMenuHeader = not hasTable[k].hasItem,
                     icon = invImg(k),
@@ -40,6 +41,7 @@ function sellMenu(data)
                     end,
                 }
             end
+        end
     else
         for k, v in pairsByKeys(data.sellTable) do
             if type(v) == "table" then