She was singing “16 Carriages,” as she sat in the back of a red convertible prop high above the crowds on Saturday, when it suddenly slanted in the air.

Beyoncé’s Saturday night concert in Houston, Texas, screeched to a halt when a set piece malfunctioned while she was suspended over the crowd. The pop star was being carried through the air in a red prop Cadillac when the car began to tilt sideways as it turned a corner during a performance of her single “16 Carriages.