Amazon‘s Zoox issued a software recall for 270 of its robotaxis after a crash in Las Vegas last month, the company said Tuesday.

The recall surrounds a defect with the vehicle’s automated driving system that could cause it to inaccurately predict the movement of another car, increasing “the risk of a crash,” according to a report submitted to the National Highway Traffic Safety Administration.

Zoox submitted the recall after an April 8 incident in Las Vegas where an unoccupied Zoox robotaxi collided with a passenger vehicle, the NHTSA report states. There were no injuries in the crash.

“After analysis and rigorous testing, Zoox identified the root cause,” the company said in a blog post. “We issued a software update that was implemented across all Zoox vehicles. All Zoox vehicles on the road today, including our purpose-built robotaxi and test fleet, have the updated software.”

Zoox paused all driverless vehicle operations while it reviewed the incident. It’s since resumed operations after rolling out the software update.

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