Hello !
The server console is spamming this : https://pastebin.com/X78quzTQ
It doesn't crash and seems to be working fine, the spam worries me though.
Thanks in advance
Jin

It would be nice if Galacticraft were open sourced, so we could know exactly what is happening. Do you have any other mods installed?

I do yes, here's the modlist:
https://pastebin.com/YZsRPwDi