🚨 Error: Cannot read property 'set' of undefined

[ampprojectbot]

Details

Error report: link
First seen: Apr 8, 2020
Frequency: ~ 2,464/day

Stacktrace

Error: Cannot read property 'set' of undefined
    at innerHTMLDesc (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/polyfills/custom-elements.js:687:26)
    at installPatches (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/polyfills/custom-elements.js:517:4)
    at observe_ (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/polyfills/custom-elements.js:343:4)
    at define (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/polyfills/custom-elements.js:150:4)
    at win (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/service/custom-element-registry.js:144:2)
    at registerElement (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/service/custom-element-registry.js:117:4)
    at stubElementIfNotKnown (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/service/extensions-impl.js:615:4)
    at LEGACY_ELEMENTS (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/service/extensions-impl.js:614:2)
    at stubLegacyElements (https://raw.githubusercontent.com/ampproject/amphtml/2004172112280/src/runtime.js:96:2)

Notes

@jridgewell modified src/polyfills/custom-elements.js:687-687 in #17205 (Aug 3, 2018)
@jridgewell modified src/polyfills/custom-elements.js:516-519 in #19305 (Nov 15, 2018)
@jridgewell modified src/polyfills/custom-elements.js:332-343 in #17205 (Aug 3, 2018)
@jridgewell modified src/polyfills/custom-elements.js:140-196 in #17205 (Aug 3, 2018)
@jridgewell modified src/service/custom-element-registry.js:144-144 in #25141 (Oct 19, 2019)
@dvoytenko modified src/service/extensions-impl.js:615-616 in #7312 (Feb 17, 2017)
@renovate-bot modified src/service/extensions-impl.js:614-614 in #27350 (Mar 30, 2020)

Possible assignees: @jridgewell, @jridgewell

[caroqliu]

cc @jridgewell

[jridgewell]

Looking at this, it's happening a lot with YaBrowser and YandexSearch (both Yandex browser in Russia). In fact, I'm reasonably certain all of the iOS UAs are being spoofed, because the error stack format is Chrome's (not Safari's). I don't have a Ya browser to test on, and I'm unwilling to install it.