InventoryClickEvent: Shift-click duplicates item

So I'm trying to cancel InventoryClickEvent when you click on a item with a specific lore. When I shift-click it in the inventory, it duplicates the item and puts it in the inventory. It's not a ghost, I assure you (I can make a beacon from it)

Code:

        if(p instanceof Player)
        {
            if(e.getView().getTopInventory().getType().equals(InventoryType.PLAYER))
            {
                if(e.getCurrentItem().hasItemMeta())
                {
                    if(e.getCurrentItem().getItemMeta().getDisplayName().contains("§e§lBind: "))
                    {
                        if(e.getSlot() >= 0 && e.getSlot() <= 8)
                        {
                            e.setCancelled(true);
                            p.updateInventory();
                            p.closeInventory();
                            e.setResult(Result.DENY);
                        }
                    }
                }
            }
}

When I take out the getSlot, getDisplayName and hasItemMeta lines, it works fine, but it'll just cancel every InventoryClickEvent event.

 

Wbjpen set the cursor to air and then cancel it. this should prevent a duplicate.

 

I added e.setCursor(new ItemStack(Material.AIR));
That didn't work.