Currently running a server on 1.12.2 with forge .2768. When using the latest edition of Immersive Engineering (0.12-87), the game and server simultaneously crash when attempting to reload a revolver, in the right or left hand.

Would help if you provided a crashlog =P

That's the .log.gz file from when it ran into the issue right?

It shouldn't be a gz file, no. There should be a "latest.log" file in the log folder. Of course if you restarted the server since, it's probably best if you reproduce the issue first and then fetch the log.

Unfortunately I did restart it since then. I'll reproduce the issue and get that to you ASAP.

Here's the log from the crash when it occurred. I'll try and keep an eye on this thread in case you require any more info. Thanks for your help!

2018-12-18-2.log

Same error as #3319

Fixed for next release already.