on most maps is the same bug:
i've got the elite rifle. and every time i scroll down e.g on "Battle of geonosis" or "Naboo theed hanger", the game crasched

In other words, your game crashes when you try to switch weapons, correct? In that case, it's a side issue, which you can't fix on your end. That's something the author would need to fix with an update.

To be more specific, that's the famous "award weapon" bug. It's caused by an incorrect reference to an award weapon in a new/modified weapon. It's totally side related. (and it isn't in the original SWBFII, so it's probably a mod that you're currently using)

You could create a new profile so you no longer have any award weapons.

If I remember correctly, it's caused by removing the award weapon from the unit without also disabling the award weapon unlock parameters. The game expects an award weapon to be present once the award is earned, but since it's not there, BAM.

right click on your imp/rep etc and press restore previous versions. If it comes up with a result press restore and your stock side should come back.

Hope that helps...