NKOTB member Jonathan Knight has apologizes for walking offstage during a concert in NYC on Thursday.

Knight took the stage at manhattan's iHeartRadio Theater alongside his band mates but left halfway through the hour long set and did not return. 

Reports say that Knight was visibly out of sync with his band mates and kept to the back of the stage an even answered his cell phone during the performance.

Good thing that other group members rallied around the singer.

When Knight was set to perform the ballad "Survive You," he laughed, attempted to sing and then stopped before leaving the stage, according to Billboard.

The singer took to twitter to apologize simply saying, "I'm sorry."