Mys v1.3.4 Item Shop Mod(s): NPC + Item Display + Tooltips

[Corsair]

Unrelated to my last post but I'm having a issue with key items being able to be sold in the inventory.

I saw:

if($item->category !== "Key Items") {

So I assumed if the category was "Key Items" that would fix it but I got a error.

Catchable fatal error: Argument 1 passed to GUIContainer::add() must be an instance of GUIComponent, null given, called in /home/monstari/public_html/view/inventoryview.php on line 72 and defined in /home/monstari/public_html/classes/class_guicontainer.php on line 361

I tried to I tried to figure it out but I am stumped. I am not to far along my php studies so maybe the fix is right in front of my face but I can't see it.