On Thursday, during its quarterly meeting, NASA’s Aersopace Safety Advisory Panel dropped some significant news about a critical commercial crew test flight. The panel revealed that Boeing’s Starliner may have been lost during a December mission had a software error not been found and fixed while the vehicle was in orbit.

The software issue was identified during testing on the ground after Starliner’s launch, said panel member Paul Hill, a former flight director and former director of mission operations at Johnson Space Center in Houston. The problem would have interfered with the service module’s (SM) separation from the Starliner capsule.

“While this anomaly was corrected in flight, if it had gone uncorrected it would have led to erroneous thruster firing and uncontrolled motion during SM separation for deorbit, with the potential for catastrophic spacecraft failure,” Hill said during the meeting.