Broken b string

As i had late duty previous day and now free , i slept a bit longer. After a good cup of coffee took up my guitar to practice a bit , just to sustain the flexibility in hands. Normally i use medium pics but took this time the Dunlop stubby pick which is heavy and creates good nice overtones like Billy Gibbons style. Unfortunately , all of a sudden , my b-string broke down. Bummer! Allthough i bought the most expensive ones of GHS Boomers , they must have some weakness. Up to the music store now. B&W