Hi jubilaye. It's different for everyone. Probably depends on your system's current state (if it's an old installation of windows, you're just going to have more problems with errors).
I reinstalled Windows recently.. And the game actually runs (it fully wouldn't launch due to EasyAntiCheat error before).
Only 1 random crash due to player model load-in so far! Take from that what you will lol.
But yeah, Mortal Online 1 (and especially MO2 at the moment) is known for random crashes.
It sounds like it could be corrupt files, so try 'verify installation' in the game's settings on steam. Other than that... Reinstall Windows probably.
Sucks to have to do, but helps lol.