Stopping players from removing helmet problem

So I'm trying to make a pretty basic hat plugin just to practice, but I've come across this strange problem,
Here is my current event code;

PHP:

@EventHandler(priority = EventPriority.NORMAL)
    public void armorClick(InventoryClickEvent event) {
        if(event.getSlotType() == InventoryType.SlotType.ARMOR)
        {
            event.setCancelled(true);
        }
    }

It works for the first click, but after that it allows me to take the item out of my helmet slot, why is this happening and how can I fix it? Thanks!
Here is a quick video I made of what's happening:
https://dl.dropboxusercontent.com/u/37687953/Recording.webm

 

Try:

Code:

if(event.getSlot == SlotType.ARMOR) {
event.setCancelled(true);
}

 

Can you show more of your code? Maybe your JavaPlugin class, what you have should work, unless you forgot to register the events or something.

 

Here's the odd thing, it started working now, and I have no idea why. Thanks anyway though.

 

Can you mark the thread as solved?

 

Sorry, forgot to mention that it still doesn't work 100% properly, not sure what's causing it not to work but sometimes it works, and sometimes it behaves like in the video I linked :/

 

@bloodless2010