🚨 Error: b.signals is not a function

[ampprojectbot]

Details

Error report: link
First seen: May 2, 2019
Frequency: ~ 2,824/day

Stacktrace

Error: b.signals is not a function
    at signals (extensions/amp-image-viewer/0.1/amp-image-viewer.js:182:8)
    at layoutCallback (src/custom-element.js:1625:50)
    at src/core/data-structures/promise.js:82:12
    at src/core/data-structures/promise.js:81:9
    at tryResolve (src/custom-element.js:1625:22)
    at layoutCallback (src/service/resource.js:897:40)
    at ret (src/service/vsync-impl.js:468:16)
    at callTask_ (src/service/vsync-impl.js:425:8)

Notes

@kristoferbaxter modified extensions/amp-image-viewer/0.1/amp-image-viewer.js:182-182 in #34028 (May 20, 2021)
@jridgewell modified src/core/data-structures/promise.js:82-85 in #15143 (May 8, 2018)
@renovate-bot modified src/core/data-structures/promise.js:81-81 in #27350 (Mar 30, 2020)
@dvoytenko modified src/custom-element.js:1625-1625 in #32345 (Feb 4, 2021)
@dvoytenko modified src/service/resource.js:897-897 in #32099 (Jan 21, 2021)
@jridgewell modified src/service/vsync-impl.js:468-469 in #20836 (Feb 14, 2019)
@rsimha modified src/service/vsync-impl.js:425-425 in #23363 (Jul 17, 2019)

Seen in:

• 05-21 Nightly (0438)

/cc @ampproject/release-on-duty

[ampprojectbot]

A duplicate error report was linked to this issue (link)

[ampprojectbot]

A duplicate error report was linked to this issue (link)

[rcebulko]

@kristoferbaxter This and the dupes have only been seen in the 05-21 Nightly as far as I can tell, suggesting ampproject/amphtml#34028 is a very likely culprit. Would you mind taking a look at this?

[kristoferbaxter]

I added a change to try and address. Unfortunately there isn't any test coverage for these cases.

Will look at more examples tomorrow and reach out if I can't reproduce.