SpaceX has scrubbed an attempt to launch its 10th test flight of the Starship megarocket due to “an issue with ground systems.” The rocket system has experienced a string of explosive missteps this year.

Engineers completed a final test of Starship's propulsion system with a so-called "spin prime" test Wednesday at the launch site in South Texas. Ground crews then rolled the ship back to a nearby hangar for engine inspections, touchups to its heat shield, and a handful of other chores to ready it for liftoff.