Type of bug

Error in console

/ess version output

https://nekobin.com/biworatuki

Server startup log

https://nekobin.com/gomecavuca

EssentialsX config files

https://nekobin.com/linawebepi

Error log (if applicable)

https://nekobin.com/viqesekiwi

Bug description

I figure out why it happened, I had a command that would run /hat with an OP status but if the user had air in their hand then the crash would happen.

Steps to reproduce

Tuinity/Tuinity#281

Expected behaviour

It shouldn't crash the server.

Actual behaviour

It shouldn't crash the server.

Cannot reproduce:

[03:36:58 INFO]: Server version: 1.16.5-R0.1-SNAPSHOT git-Paper-597 (MC: 1.16.5)
[03:36:58 INFO]: EssentialsX version: 2.19.0-dev+104-5171215
[03:36:58 INFO]: LuckPerms version: 5.3.21
[03:36:58 INFO]: Vault version: 1.7.3-b131

These are the steps I followed:

1. Log onto server as an OP.
2. Attempt to run /hat with nothing in my hand - no crash
3. Use /hat while holding another block - other block is now on my head
4. Attempt to run /hat again with nothing in my hand - no crash

When using /hat with nothing in my hand, all I received was the error "You must have something to wear in your hand!". Could you please try and reproduce your problem on one of our supported server implementations (CraftBukkit, Spigot, or Paper)?

Closing - no response from OP. If this is still an issue and can be reproduced on supported server software, please reply to this thread with proper reproduction steps.