Note: I installed Rubidium and Not Enough Crashes. I have reproduced this crash with rubidium, rubidium & not enough crashes and not enough crashes.

To reproduce:

1. Die, until you have a humanoid flesh.
2. Hover over said humanoid flesh IN THE INVENTORY (searching for it in jei is fine).

I did not get in contact with evilcraft beforehand.

crash-2022-09-14_09.15.07-client.txt (rubidium only)
https://crashy.net/cpU5pqCTw1d6sZXYC20S (rubidium & not enough crashes)
crash-2022-09-14_09.31.09-client.txt (not enough crashes only)

Reported to EvilCraft:
CyclopsMC/EvilCraft#940
Reported to Magma:
https://git.magmafoundation.org/magmafoundation/Magma-1-18-x/-/issues/102

I am unable to reproduce this in pack version 0.4.30 and with rubidium 0.5.3a, try updating your pack version and report back if this still crashes

I tried singleplayer (v.0.4.30, could not reproduce) and I tried upgrading evil craft to 1.2.8 (v. 0.4.29 otherwise, could reproduce) and evilcraft v. 1.2.8 (v. 0.4.29, singleplayer, could not reproduce).
Some server incompatibility is there.
Also I cannot just upgrade the server to v. 0.4.30, since I do not have permission to do so (I am part of staff team however)

Edit: I also cannot test regular 0.4.29 singleplayer, because I keep instacrashing on world load
Edit: We will be updating later on. Not entirely sure when, but I'll post a update in a new post, when we do.

crash-2022-09-14_21.01.21-client.txt
Even on a v.0.4.30 server I crash. This is with rubidium + not enough crashes.
If I understand correctly the server is runnning with magma, since we have (and need) some plugins to keep servers running smoothly.
Another staff-member (the one how set the server up) had the same issue (I don't think he uses any extra mods).

I know we used Mohist too but moving to 1.18 plugins are almost not necessary anymore and the performance and stability just sucks. For the copy paste: I didn't notice that both issues were created by you mb

I have reproduced this issue with only magma,evilcraft and cyclopscore.

I wouldn't recommend to use magma at all especially the 1.18 version is still highly unstable. And Magma as well as Mohist have forge poorly implememted some parts are not implemented correctly and many are even missing.

And since you love copy+paste, here again:

Also @Jorue23 we need Magma for plugin support.
Like profilers, kits, worldedit and permissions.

FYI profilers (spark and observable) are in the pack by default, FTB Ranks is in the pack, there are probably multiple options for kit mods, and WorldEdit has a Forge version. Unfortunately we cannot provide support for Bukkit hybrids, since they make so many changes to Forge in the process.

I tried searching for 1.18 kit plugins, and really did not find anything that was server only and has permission integration (let alone protection from duping keys).
Forge really still isn't an option. This has been reported to Magma, and they need to fix it. Sure.
You also can't support plugins. Sure.
But don't just blindly assume, that there are options out there.

I didn't blindly assume. I'm hosting myself on 1.16 and 1.18 and we have kits. Like I said before we used Mohist before which is essentially the same I'd say even a bit better and it didn't work well so we turned back to forge and we still have almost the same content as before.