Problem/Bug Removing skulls with WorldEdit

Hello,

I'm using CraftBukkit 1.7.9R0.1 and Worldedit 5.6.3. There is a major issue on my server who use a Vanilla glitch (https://bugs.mojang.com/browse/MC-65279) Chests can be breaked with skulls and I seek since a while a solution for resolving this problem. I've also disabled PlayerHeads due to the exploit. But with WorldEdit, I want to replace the skulls by air block. When I do the selection then typed //replace 397:2 air for replacing the zombies head by the air, these heads doesn't got removed, and I found it weird because it work with all blocks. There is another way to replacing heads with WorldEdit ?

Thanks.

 

If you go into creative and middle click your mouse to 'pick' the head what ID is the item you get? Hopefully try that and hope its not a zombie head

 

Finally I found the proper syntax, it's //replace head air for replacing all heads in a selection, not its id.