[help] Cancelling Inventory click causing bugs

Hey,

Im currently working on a Inventory Menu, its completly working so far. But its causing a bug which i don't know how to fix.

in my onEnable i create a custom inventory named "Permission". Adding items afterwards, and added a command to open the inventory with player.openInventory(Teleport);

Okay, here is my listener:
http://pastebin.com/GD3yCXVa


Now the bug description:
If a player clicks on a item via shift click or the new shortcut system or however its called (1-9) to assing a item to the hotbar. Since the event is cancelled, it does not move the item out of the custom inventory, but it is actually there. Which makes the player unable to build any things where the item was supposed to be, till they relog.

Here is a video, i bought something in my shop. Then crafted a Crafting table, tried to place it, and it turned to dirt.


Any ideas how to cancel the click event without causing such bugs?

(Sorry for my bad english, its late ;p)

 

Try using player.updateInventory(); It's deprecated but thankfully still works.

 

If you check the code, im using it already. Bug does still occour :/

 

This can be caused by lag too

 

Its not caused by lag, cause it happens AFTER you use the shop/interface/menu or whatever, it doesnt happen at all if you dont use the menu.

 

What about Saving the Item which was klicked and adding it after the Event to the Inventory?

Lualzockt

 

I dont want to add a item at all, this plugin is just adding a permission node via vault. But cuz of the cancelled item click event, the client is adding a item to the inventory till they relog to the server and this is causing the bugs like i showed in the video.