Well I mean, there’s probably a reason they have no friends. So I’d figure that out before you make a serious commitment. Also that can make it hard to be more social with your own friends. They may be jealous and not want you to go out with your friends as much, and even if you invite them they still might not want to go. It just depends on their reasoning for not having any friends. Just be careful because when you date someone like that you can slowly become more antisocial as well. And eventually you may not have many friends either or at least not see them very much due to encouragement from that person.