Justin Bieber had another mishap involving a block of glass, this time during a concert in Paris.

Bieber was performing on stage when he went backstage between songs and hit the glass. He got back on stage and finished the show, but passed out for about 15 seconds. Doctors say Bieber suffered a concussion, but he's expected to be OK.

Bieber told TMZ.com, "I guess me and glass windows just don't work," referring to a recent incident where he hit his head on a glass revolving door.