Harness status: Error

Uncaught TypeError: Cannot read properties of null (reading 'documentElement')

TypeError: Cannot read properties of null (reading 'documentElement')
    at run (https://www1.wpt.live/svg/types/SVGElement.ownerSVGElement-02.html:11:38)
    at HTMLIFrameElement.onload (https://www1.wpt.live/svg/types/SVGElement.ownerSVGElement-02.html:24:73)