Server crashing when certain amount of mods are added

[trianglesphere]

I've been trying to set up a modded forge server on version 1.12.2, with my own list of mods.

The mod list works completely fine clientside - everyone planning on joining has played in single player games with all the mods working fine but when I add exactly the same mod list to the server it crashed with the error "Exception in server tick loop"

Upon further research, it specifically crashes as soon as I add over 17 mods. Any less and it works without issue, but if it goes over exactly that, regardless of what mods are currently loaded it crashes.

Any advide?

crash-2020-04-01_19.30.06-server.txt