More-Planets-1.12.2-2.1.3-GC181
forge-1.12.2-14.23.4.2705
other mods as per crash report:
https://pastebin.com/Z5iR4LJg

Mod calling client code from server?
Works ok when playing single player but crashes on server
rolling back to previous version More-Planets-1.12.2-2.1.2-GC177 then it works ok on the server again