Version Info

• Forge, 47.3.11
• Minecraft, 1.20.1
• Simple Magnets, 1.1.12

Steps to Reproduce
I was sailing on a boat while the Advanced Magnet was on, accidentally picked up some kelp, pressed Q on the go to throw it away and the server instantly crashed.
More details, I got a same crash when I activated the magnet in my hands and there were no items for attract around, the same error.

Crash report (~/logs/latest.log)
crash-2024-10-19_10.32.56-server.txt
latest.log

Some addition, opening the world now instantly causes the same crash over and over again

I'm having the same problem

same problem, i'm going to use 1.1.11 for the time being

Same here.. but I haven't even made a magnet yet. Threw some coal and got booted.
After being booted I coldn't get back into the server till I replaced the mod with the older version.
Forge, 47.3.10
Minecraft, 1.20.1
Simple Magnets, 1.1.12

Also experienced this, "exception ticking world" crash when I accidentally dropped a cooked chicken with Q. Downgrading to 1.1.11 fixes the issue.
crash-2024-10-19_14.57.33-server.txt

I had this error too, but also an even worse one where when starting up the world would freeze as terrain was loading and simply hang.

Same issue here, but mine didn't start crashing until I updated Alex's Caves to the new 2.0 update.
latest.log

i'm having the same issue as well, server crashed after updating and trying to turn magnet on
can't post crash report because it's stuck on shutting down process

This should be fixed now in the dedicated file for 1.20.1.
Thank you for reporting the issue!