A man was stabbed in the neck by another customer at a Chelsea sex shop last night.

Police say the incident happened around 12:40 a.m. at 725 Video, a 24-hour sex shop on 6th Avenue near 23rd Street. The two men, neither of whom worked at the shop, were engaged in an argument (it's unclear what it was about) when the 20-year-old suspect stabbed a 54-year-old man in the neck. The suspect fled the store, and the victim was taken to Bellevue Hospital in stable condition.

"I heard people fighting, looked over and next thing I know a guy is bleeding on the ground," a witness told the Daily News. "The guy stabbed him in the throat and just ran out the door."

Police described the suspect as wearing a green shirt with a white stripe, a black jacket and blue jeans. No arrests have been made, and the investigation is ongoing.