6/26 10:02 AM PT -- TMZ Sports has obtained dispatch audio from the incident in which you can hear a law enforcement official tell officers, "BJ Penn is back there trying to fight everybody. No weapon."
When cops arrived to the scene, the officers told dispatch Penn had "ran off" and was no longer at the club.
8:31 AM PT -- Law enforcement sources tell us ... cops DID, in fact, respond to the club after receiving a call about an "argument at an adult night club."
However, we're told Penn was NOT arrested -- and a warrant for his arrest has not been issued.