Andy Kallas claims he was beaten "for several minutes" and "suffered serious injuries to his head, mouth and face," according to a complaint filed April 30th in Cook County Circuit Court and reported by the Chicago Sun-Times.
"I don’t know if [Wentz] mistook [Kallas] for somebody else, but for whatever reason, he decides to clock Andy in the face," Kallas attorney Jim Zouras said. "[Wentz] then appeared to let his colleagues finish the job."
Kallas said that Wentz’s security stopped him from leaving and that the attack was unprovoked, according to the paper.
The four-count complaint seeks unspecified damages from Wentz, his security team and Schubas.
Wentz & co. released a statement saying Kallas doesn’t have a case.
"This case is meritless. We looked into it, and the facts don’t support his claims. We will vigorously defend this case in court."
The Sun-Times reported that concertgoers at the time said Kallas repeatedly heckled Wentz during the show, insulting him about his relationship with singer and now-fiancee Ashlee Simpson.
Wentz said in an interview that Kallas lunged at him after Fall Out Boy left the stage at the 200-capacity venue, according to the Sun-Times.
A Schubas representative declined to comment to Pollstar.