A lawsuit has been filed against General Motors for a Dec. 7 crash involving a Cruise autonomous test vehicle and a motorcyclist.

Last Monday, the plaintiff, Oscar Nilsson, filed the lawsuit in the U.S. District Court in San Francisco, Calif., alleging that a self-driving Bolt made an abrupt lane change, ejecting him from his seat. Nilsson now seeks unspecified damages as a result of neck and shoulder injuries forcing him to go on disability leave.

Both GM and Nilsson’s accounts differ, with Nilsson claiming he was riding behind the Cruise before zipping forward as the Cruise veered to the left lane, knocking him off. In a California Department of Motor Vehicles crash report, GM parries Nilsson’s account by claiming he lane-split in between two lanes before crossing to the center lane and hitting the vehicle.

The same crash report cited the human-manned Bolt traveling at 12 mph and Nilsson at 17 mph.

The accident report also assigns fault to the motorcyclist.

“… the motorcyclist was determined to be at fault for attempting to overtake and pass another vehicle on the right under conditions that did not permit that movement in safety …”

The latest crash with a self-driving car may spark a fresh round of debate over the culpability of autonomous vehicles in crashes. Many have debated the judiciary responsibility of a self-driving vehicle’s owner versus its manufacturer in a collision.

Other debate points have included liability when two self-driving vehicles collide, specific to insurance companies and property damage payouts.

In 2016, the U.S. Department of Transportation issued guidance on self-driving cars, assigning responsibility to each state in determining liability and insurance regulations amongst owners, passengers, manufacturers and other affected parties. Some progress has already been made, as is the case with Michigan’s 2016 first-ever legislation, stating that manufacturers are responsible for paying collision damages if a self-driving vehicle is determined to be at fault.

Since June 2015, General Motors has been testing its fleet of Cruise self-driving vehicles, deploying more than 100 vehicles and 300 test drivers on the road to date.