The club, which was closed at the time, had been built as a wooden extension to a building in Metelkova and quickly caught fire.
"The exterior of the club is completely destroyed, and the inside somewhat less due to a quick and effective response by firefighters," the club said on its Facebook page.
Nearly 20 firefighters fought the flames which completely engulfed Jalla Jalla.
The Jalla Jalla team has already started cleaning up and determining the damage, the post reads. Media reports estimate the damage at thousands of euros.
The fire also spread to the roofing of the adjoined building, but firefighters contained it before it could do serious damage to the woodworking workshop in the building.
More images like the ones below can be found at Jalla Jalla's Facebook page