I had the same kind of crack at the 12 o' clock position on my frame, and that's where it ended up cracking a few months later. Be careful with it.
1. Bring it to an experience stringer or dealer, and let them examine it. It's too hard to tell from the pic. 2. How did you get this? From a string job?
Well since i've already broken one Ns9000, i have a second one cracked already. Hairline Fracture and will break anytime soon. After many clashes with tension of 30lbs. I would say this NS9000 really last.