There seems to be a strange issue with Old Guns 1.16.5 on servers, in which when you craft something, the server crashes.

Steps to reproduce the behavior:

1. Add Old Guns mod to a server
2. Attempt to craft something with the Gunsmith Bench
3. Crash

The expected behavior would be that you can normally craft with the Gunsmith Bench like in Singleplayer

Mod Version
1.16.5-3.0.6-23

Mod List

oldguns_v1.16.5-3.0.6-23.jar

...

The crash report is attached.
crash-2022-08-02_01.44.23-server.txt

Fixed with release v1.16.5-3.0.7-35