Yep, I had the same thing happen several years ago. It got snagged on a shelf at work and broke it right off. I'll never own another kydex holster with an integrated clip again. Luckily I was carrying a BUG in my pocket too so I wasn't left completely disarmed the rest of the day.
The holster was included in the deal for the gun that's the only reason I had it. It was at least 5 years old. I'm surprised it lasted this long with daily use.