SpaceX was poised to launch another critical test flight of its massive Starship rocket on Sunday, a mission that comes with heightened stakes following a series of explosive setbacks this year.

SpaceX delayed a critical test flight of its massive Starship rocket roughly half an hour before liftoff on Sunday, saying it needed to fix a liquid oxygen leak and that it would aim for another launch on Monday night.

SpaceX wants to put the two-stage rocket's massive booster through its paces. The flight test comes as the multibillion-dollar Starship program has suffered a streak of failures this year.