Café Opera has a total of eight surveillance cameras, two of which look out over the area in front of the entrance where a bouncer is alleged to have attacked and seriously injured a customer.
When a police officer went to pick up the footage on Monday he was told that there had been a problem with the graphics card and there were no images, Dagens Nyheter reports.
“If there has been a fight we will want to secure the footage as quickly as possible. Unfortunately we are often foiled by staff saying they don’t know how to access the computer,” police spokeswoman Annika Lindahl told Dagens Nyheter.
“It doesn’t feel good that the bouncers themselves can go into the system and make changes while waiting for an investigator to make contact,” she added.
Police now have to rely on witness accounts of the incident outside Café Opera.
The bouncer was arrested after witnesses said that he had been heavily involved in a violent fracas outside the fashionable night spot.
“He was identified by several witnesses as having beaten a person and kicked them in the head. That person is very seriously injured,” police spokeswoman Ann-Charlotte Wejnäs told the TT news agency.
According to the police spokeswoman, the row started when one of the guests who had been asked to leave demanded to go back in to retrieve an item of clothing.
A total of seven or eight people are thought to have been involved in the fight.