Crack in fiberglass bath floor?

The camper 2003 Lance 815, we are planning on buying has a crack in the bath. I have not seen it yet but the owner said it is in the door way. I asked if he thought water had leaked under the shower and he did not think so. He said they have never used the shower, the only water would haave been from the sink. Any suggestion on what I should do, does the shower have a replacement floor? What should I look for and what do any of you think it would cost to repair.