You mean like a rogue black hole, that doesn't stay in one place like most stars, but meanders throughout space? That could be a disaster waiting to happen. It's going to one hell of day if the star collides with another star, or encounters a rouge black hole. Not to mention rouge comets. Probably safer from gamma ray bursts though.
If I see any holes or inconsistencies, I'll be sure to sure to say something. Inconsistencies are one of those banes of any series, which is best avoided as possible.