Katy Perry experienced a frightening onstage mishap Friday night during her Lifetimes Tour stop at the Chase Center in San Francisco. While performing her hit song “Roar,” the pop star was seated atop a large butterfly-shaped prop that was designed to fly above the crowd.

As People notes, Perry endured a previous stage malfunction during the tour's Australian leg when a flying sphere she rides in began tilting mid-performance, forcing her to cling to the cables connected to the sphere.