Welcome aboard Kaleun
The game crashing can be down to dozens of reasons...a faulty install, a non compatable mod, the failure to install a CFG file with a third party/standalone programme such as SH3 Commander, weak system specs, the gaming conditions when your saving the game etc. etc.
In order to assist the good folk here in suggesting a possible fix could you post your system specs and precisely what mods you have in your installation.
I have read your post carefully but the more detail you can provide the more chance of a positive resolution