An electrical malfunction triggered a fire at a Riverside shopping center that caused $15,000 in property damage to one business and left a firefighter with minor injuries, officials said Tuesday.

The blaze was reported at 7:20 p.m. Monday at 11070 Magnolia Ave., near La Sierra Avenue, on the city’s west side.

Riverside Fire Department Battalion Chief Garrett Coryell said nearly two dozen firefighters arrived to find a “working structure fire in the front office” of one of the businesses.

The fire was fully contained within 20 minutes to the room of origin and was traced to a failed electrical component, he said.

The building’s anti-fire sprinkler system activated during the blaze, causing some water damage, Coryell said.

He said one crew member suffered unspecified minor injuries but did not require hospitalization.