A big public debut for a self-driving bus in Las Vegas turned out to be trouble.
An autonomous shuttle bus collided with a semi-truck just a few hours after Las Vegas city officials held a ceremony to celebrate its first day as part of a larger city-wide test.
There were no injuries reported, and the shuttle didn’t suffer any major damage, according to a report by a local Fox news station.
More from FORTUNE
Las Vegas city officials said in blog post that the self-driving shuttle, built by the French automobile company Navya, was not at fault. Although a delivery truck “grazed” the shuttle, the post said, the ”shuttle did what it was supposed to do, in that its sensors registered the truck and the shuttle stopped to avoid the accident.”
“Unfortunately the delivery truck did not stop and grazed the front fender of the shuttle,” the officials wrote. “Had the truck had the same sensing equipment that the shuttle has the accident would have been avoided.”
The shuttle, called Arma, can carry up to 12 passengers. It is built without a steering wheel or brake pedals for human drivers, according to the Fox report.
Get Data Sheet, Fortune’s technology newsletter.
The accident occurred on the first day of the Arma shuttle’s 12-month long test in downtown Las Vegas over a half-mile route near the city’s strip. Las Vegas city officials said that the city would continue to test the shuttle despite the accident. The delivery truck driver was given a citation, the officials added.