KATT WILLIAMS GOT ARRESTED FOR HAVING A GUN IN THE CLUB!

Katt Williams was hauled in by LAPD last night for a possible gun violation at a Hollywood nightclub.

Law enforcement sources tell TMZ police got a call around 1AM that someone was brandishing a gun at Supper Club ... and when officers arrived on scene a witness identified Katt as the suspect.

TMZ was told police did not find a gun on Katt, but when they found one in his car -- Katt and two other members of his entourage were taken into custody for questioning.

Police have since released one of the men, and booked another on an unrelated traffic warrant.

4:55AM PT: Katt got released without any charges. TMZ was told the gun was unregistered and police are trying to find out who owns it.

Katt tells TMZ it was all just a misunderstanding.

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