Sam Smith, who was slated to perform Friday night (9/21) at the 2018 iHeartRadio Music Festival, announced around 9 PM PT, after the show had already begun, that he was forced to cancel due to “unforeseen circumstances.”

According to his statement on Twitter and what Ryan Seacrest told the T-Mobile Arena crowd during the show, the singer had rehearsed for his performance as scheduled but something “transpired after rehearsal” that kept him from performing.

“Dear all, Due to unforeseen circumstances which transpired after rehearsal, it became clear that I’m sadly unable to perform at the iHeart Radio Music Festival in Vegas tonight,” his Twitter statement reads. “I am so so sorry about this and I want to apologise to all my fans. All my love, always. Sam x.”

Dear all, Due to unforeseen circumstances which transpired after rehearsal, it became clear that I’m sadly unable to perform at the iHeart Radio Music Festival in Vegas tonight. I am so so sorry about this and I want to apologise to all my fans. All my love, always. Sam x

— Sam Smith (@samsmith) September 22, 2018

The show must go on, and in addition to already-performed sets from Fleetwood Mac, Childish Gambino and Jack White, the crowd still has performances from Mariah Carey, Rae Sremmurd, Jason Aldean, Kygo, and Panic! At The Disco to look forward to.

This article originally appeared on Billboard.