Hi!

I'm getting this errors while starting server. Here's my latest.log, config.yml, items.yml, recipes.yml

The issue had to do with the fact that empty spaces in inventories were previously not null items, but air.
I resolved it by adding simple null checks in the InventoryClick handler functions in the GUI's.

Thanks for reporting the issue with the required logs so it was easy to find and resolve.

It's fixed in version 2.3.2.