Phones are not for flying.

Bring Me the Horizon frontman Oli Sykes suffered a mild concussion when a fan launched their phone at him while he was on stage during a concert.

Sykes was struck when he and the band, known for their high-energy performances, were mid-performance of their song “Happy Song” in front of 22,000 at the Enterprise Center in St Louis, Mo. on Monday night.

Bring Me the Horizon frontman Oli Sykes suffered a concussion after a fan threw their phone at him on stage in St Louis, Mo. Oli Sykes / Instagram

“Who the f— just threw a phone at my f—in’ head?…