Issue (The better the description the better i can solve the issue):

Ticking entity crash with "Better Slimes - RotN Edition" when King Slime is killed.

Note: I have all AI types set to "whitelist", and no slimes are whitelisted for any AI task, so I don't think it's any Improved Mobs AI affecting King Slime that could have caused this.

Steps to reproduce:

Kill King Slime.

Affected Versions (Latest is NOT a version):

• Minecraft: 1.12.2
• Forge: 1.12.2 - 14.23.5.2854
• TenshiLib: 1.2.4
• Improved Mobs: 1.6.10

Other Mods (If you think it might be cause of an incompatibility):

Better Slimes - RotN Edition

Logs (Use a site like pastebin, gist etc. DONT COPY PASTE THE LOG IN HERE):

https://paste.ubuntu.com/p/CDpBhKYrrr/

does the mod crash on its own? the slime mod i mean

I'm pretty sure it does and is now fixed, so the crash log may have implicated your mod despite it not actually being involved. Apologies for the error.