Summers

Hey, I've been really enjoying this game so far and its so frustrating now that I can't go any further. I've got to Onderon and I every time I try to leave the starport area and go into the Merchant Quarter the game crashes and I get the 'Knights bla bla bla has encountered a problem and needs to close..' message. Has this happened to anyone else before? It sucks, cause I can't progress with the game at all now. I can't leave Onderon and I can't leave the starport area. Thanks for your help