Eric Clapton’s Madrid concert ended on a sour, very visible note after an object appeared to strike him in the chest as he was leaving the stage before a planned encore.

The 81-year-old rock and blues guitarist was performing at the Movistar Arena in Madrid as part of his European tour. After playing “Cocaine,” Clapton smiled and waved to the crowd while heading backstage, in the familiar concert ritual where the artist briefly disappears before returning for the final songs.

That return never came.