🚨 Error: Failed to read the 'cssRules' property from 'CSSStyleSheet': Cannot access rules

[ampprojectbot]

Details

Error report: link
First seen: Nov 19, 2020
Frequency: ~ 5,623/day

Stacktrace

Error: Failed to read the 'cssRules' property from 'CSSStyleSheet': Cannot access rules
    at cssRules (extensions/amp-animation/0.1/parsers/keyframes-extractor.js:54:18)
    at extractKeyframes (extensions/amp-animation/0.1/web-animations.js:482:24)
    at createKeyframes_ (extensions/amp-animation/0.1/web-animations.js:462:29)
    at callback (extensions/amp-animation/0.1/web-animations.js:619:10)
    at callback (extensions/amp-animation/0.1/web-animations.js:1019:19)
    at withVars (extensions/amp-animation/0.1/web-animations.js:617:18)
    at callback (extensions/amp-animation/0.1/web-animations.js:1003:19)
    at withTarget (extensions/amp-animation/0.1/web-animations.js:612:16)
    at forEach (extensions/amp-animation/0.1/web-animations.js:609:12)

Notes

@dvoytenko modified extensions/amp-animation/0.1/parsers/keyframes-extractor.js:51-62 in #9623 (May 31, 2017)
@alanorozco modified extensions/amp-animation/0.1/web-animations.js:482-482 in #27887 (Apr 21, 2020)
@dvoytenko modified extensions/amp-animation/0.1/web-animations.js:460-468 in #9614 (May 31, 2017)
@dvoytenko modified extensions/amp-animation/0.1/web-animations.js:619-625 in #9614 (May 31, 2017)
@dvoytenko modified extensions/amp-animation/0.1/web-animations.js:1010-1024 in #9614 (May 31, 2017)
@dvoytenko modified extensions/amp-animation/0.1/web-animations.js:617-617 in #9614 (May 31, 2017)
@dvoytenko modified extensions/amp-animation/0.1/web-animations.js:1003-1004 in #9496 (May 24, 2017)
@dvoytenko modified extensions/amp-animation/0.1/web-animations.js:611-612 in #10451 (Jul 18, 2017)
@dvoytenko modified extensions/amp-animation/0.1/web-animations.js:609-609 in #9655 (Jun 1, 2017)

Seen in:

• 08-13 Control (2216)
• 08-13 Experiment-B (2216)
• 08-13 Experimental (2216)
• 08-13 Stable (2216)
• 08-19 Beta (2119)
• +3 more

Possible assignees: @alanorozco, @dvoytenko

/cc @ampproject/release-on-duty