🚨 Error: L(...).forEach is not a function

[ampprojectbot]

Details

Error report: link
First seen: Apr 16, 2020
Frequency: ~ 17/day

Stacktrace

Error: L(...).forEach is not a function
    at childElementsByTag (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/extensions/amp-video/0.1/amp-video.js:176)
    at getVideoSourcesForPreconnect_ (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/extensions/amp-video/0.1/amp-video.js:106)
    at preconnectCallback (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/custom-element.js:540)
    at preconnect (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/custom-element.js:1152)
    at layoutCallback (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/service/resource.js:918)
    at callback (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/service/vsync-impl.js:470)
    at callTask_ (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/service/vsync-impl.js:426)
    at handler_ (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/pass.js:109)
    at pass_ (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/pass.js:55)
    at callback (https://raw.githubusercontent.com/ampproject/amphtml/2004210608300/src/service/timer-impl.js:83)

Notes

@cramforce modified extensions/amp-video/0.1/amp-video.js:175-179 in #27740 (Apr 15, 2020)
@cramforce modified extensions/amp-video/0.1/amp-video.js:106-106 in #27740 (Apr 15, 2020)
@rsimha modified src/custom-element.js:1152-1152 in #21212 (May 16, 2019)
@jridgewell modified src/service/resource.js:915-923 in #20814 (Feb 14, 2019)
@jridgewell modified src/service/vsync-impl.js:470-471 in #20836 (Feb 14, 2019)
@jridgewell modified src/pass.js:105-112 in #3513 (Jun 9, 2016)
@cramforce modified src/service/timer-impl.js:81-88 in #7363 (Feb 7, 2017)

[estherkim]

Dupe