A man who claims he was punched and kicked by a member of Chris Brown’s entourage during a fight at a recording studio sued the R&B singer on Tuesday for assault and battery.

Sha’keir Duarte sued Brown for unspecified damages in Los Angeles Superior Court, claiming he suffered a concussion as well as humiliation and mental anguish as a result of the attack.

Brown’s attorney Mark Geragos called the case frivolous and said it amounted to an attempted shakedown.