As the title says, no mods are being used, only base 2.0.3.2. Solo play runs fine.

[Edited on 02/22, 23:07 UTC+8]
Again, I did not activate any mods except for the base mod.
Deleting all the mods in the folder fixed the problem.
I have 600 mods in the folder, with a total file size of around 7.7GB ...