server instantly crashes when i join the game (NullPointerException)

[lama-69]

Context

mods work just fine client side and on a single player world, with multiple active contraptions and sublevels, as well as active swivel bearings, so idk what could have happened specifically with the server

Crash Report

https://mclo.gs/x3a7BUn

[lama-69]

i can send the server world file too if needed

[superintendent2521]

its a issue with create contraptions touching (atleast i think) sable sublevels, they get very pissed off and crash the server instantly, the only way i found around this was to delete every single create entity with a custom python script i made.