🚨 Error: undefined is not an object (evaluating 'c.ampdoc')

[ampprojectbot]

Details

Error report: link
First seen: Mar 18, 2021
Frequency: ~ 2,922/day

Stacktrace

Error: undefined is not an object (evaluating 'c.ampdoc')
    at src/multidoc-manager.js:502:12
    at extensions/amp-next-page/1.0/page.js:193:11
    at extensions/amp-next-page/1.0/service.js:411:8
    at hidePreviousPages_ (extensions/amp-next-page/1.0/service.js:344:8)
    at extensions/amp-next-page/1.0/service.js:335:24
    at extensions/amp-next-page/1.0/service.js:542:6
    at relativePos (extensions/amp-next-page/1.0/visibility-observer.js:310:29)
    at topSentinelPositionChanged_ (extensions/amp-next-page/1.0/visibility-observer.js:93:4)
    at position (src/service/position-observer/position-observer-worker.js:109:20)

Notes

@wassgha modified src/multidoc-manager.js:477-518 in #25629 (Dec 10, 2019)
@wassgha modified extensions/amp-next-page/1.0/page.js:184-193 in #26296 (Jan 23, 2020)
@wassgha modified extensions/amp-next-page/1.0/service.js:410-411 in #26296 (Jan 23, 2020)
@wassgha modified extensions/amp-next-page/1.0/service.js:344-345 in #26296 (Jan 23, 2020)
@wassgha modified extensions/amp-next-page/1.0/service.js:328-335 in #25636 (Dec 10, 2019)
@wassgha modified extensions/amp-next-page/1.0/service.js:541-545 in #26296 (Jan 23, 2020)
@wassgha modified extensions/amp-next-page/1.0/visibility-observer.js:294-381 in #26778 (Apr 9, 2020)
@wassgha modified extensions/amp-next-page/1.0/visibility-observer.js:93-93 in #26778 (Apr 9, 2020)
@zhouyx modified src/service/position-observer/position-observer-worker.js:106-136 in #10813 (Sep 8, 2017)

Seen in:

• 03-24 Nightly-Control (0330+2)
• 03-24 Stable (0330+2)
• 03-26 Beta (1048+2)
• 03-26 Experiment-A (1048+2)
• 03-26 Experiment-B (1048+1)
• 03-26 Experimental (1048+2)
• +24 more

Possible assignees: @wassgha, @zhouyx

/cc @ampproject/release-on-duty

[dmanek]

FYI this has been reported before ampproject/error-reporting#4 & ampproject/error-reporting#6

[dmanek]

Duplicate of #29936