Harness status: Error

Test named 'Test with multiple cleanup functions' specified 2 'cleanup' functions, and 1 failed.

Error: exception in cleanup function
    at https://www1.wpt.live/resources/test/tests/functional/add_cleanup_err_multi.html:16:13
    at https://www1.wpt.live/resources/testharness.js:3023:34
    at forEach (https://www1.wpt.live/resources/testharness.js:4659:26)
    at Test.cleanup (https://www1.wpt.live/resources/testharness.js:3018:9)
    at Test.done (https://www1.wpt.live/resources/testharness.js:2982:14)
    at test (https://www1.wpt.live/resources/testharness.js:651:22)
    at https://www1.wpt.live/resources/test/tests/functional/add_cleanup_err_multi.html:14:1