Forge: 40.1.68
Lunchbox: 1.0.1
Minecraft: 1.18.2
Crash report: crash-2023-01-18_04.57.14-fml.txt
Will test with just Lunchbox and Forge and add a comment with additional details.

Crash still happens with just Lunchbox and Forge on the server, no other mods.
Crash report: crash-2023-01-18_05.12.22-fml.txt

Oh I see the issue here, update to alpha 1.1.0, as the mod has various server-related bugs on 1.0.1... Sorry for the confusion, but I marked it as alpha due to it being in the middle of an update I never got around to finishing yet for various reasons... (The server hotfix part is stable though!) Let me know if that solved your issue!

Ah I see, I have alpha updates hidden in the curseforge client, so I didn't see that there was an update. I'll test it and get back to you.

Server runs fine on the new version of the mod. I'll post the logs just in case, but the issue seems to fixed in the new version.
Log: latest.log

Great! Hopefully I can get the full mod update out eventually so this won't happen again... (it's colored lunchboxes, I'm being more creative than a simple recolor for this but I've been busy with other stuff)