Describe the bug
Almost every plugin that has an inventory click command, displays this bug

To Reproduce
Example: the plugin "citizens", when i use the equipment inventory. (/npc equip)

Expected behavior
Not show this error

Screenshots

Desktop (please complete the following information):

• Server Type: Paper
• Version 1.18.1 (last build)

Additional context
I am using the last plugin version, and its a bug that dont affect nothing, but my console keeps getting spammed with that
also, sorry for the bad english, i am from Brazil and my english isnt the best

have a nice day