This update has now fixed an issue that I found with players that use modded clients being able to steal the items from the GUI's. I have also added a handler that solves the potential issue of the plugin crashing when there are more than 54 players online.

If you discover any other issues with the plugin, please do send me a message or leave a post on the forum post with your issue and I'll try my best to assist you.

Change-log:
Streamlined the code.
Fixed modded clients from stealing GUI items.
Fixed potential crash when opening the Player List with more than 54 players online.