Aerosmith’s lead guitarist, Joe Perry, staggered off the stage at a concert in Brooklyn on Sunday night, amid reports from witnesses that he had appeared ill during the show.

Mr. Perry, 65, was performing at the Ford Amphitheater at Coney Island Boardwalk with the Hollywood Vampires, a supergroup whose other members include the actor Johnny Depp and the singer Alice Cooper.

Mr. Perry was “stable,” a band representative said, without offering further detail on his condition.

“Joe Perry is stable and resting,” the representative, Sujata Murthy, said in a statement. “His brother Vampires and fans wish him a speedy recovery.”