🚨 Error: Assertion failed

Details
---
**Error report:** [link](http://go/ampe/CIOw_aT74IOLwAE)
**First seen:** Mar 4, 2021
**Frequency:** ~ 1,974/day

Stacktrace
---

Error: Assertion failed

    at message (src/core/assert.js:92:29)

    at getElementsByClassName (src/service/owners-impl.js:137:34)

    at getElementsByClassName (src/service/owners-impl.js:137:34)

    at findResourcesInElements_ (src/service/owners-impl.js:95:4)

    at this (extensions/amp-consent/0.1/consent-ui.js:370:8)

    at pause (extensions/amp-consent/0.1/amp-consent.js:171:22)

    at unlayoutCallback (src/custom-element.js:1512:42)

    at disconnect (src/service/resource.js:1124:2)

    at whenSignal (src/utils/signals.js:65:2)

    at VISIBLE (src/visibility-state.js:30:11)

    at PRERENDER (src/visibility-state.js:25:13)

    at src/service/task-queue.js:87:4

    at measure (src/service/resources-impl.js:754:18)

    at Input (src/input.js:32:13)

    at delay (src/pass.js:94:36)

    at this (src/service/timer-impl.js:121:15)

Notes
---
`@rcebulko` modified `src/core/assert.js:92-93` in [#32887](https://github.com/ampproject/amphtml/pull/32887) (Feb 25, 2021)
`@lannka` modified `src/service/owners-impl.js:118-155` in [#24222](https://github.com/ampproject/amphtml/pull/24222) (Aug 30, 2019)
`@lannka` modified `src/service/owners-impl.js:118-155` in [#24222](https://github.com/ampproject/amphtml/pull/24222) (Aug 30, 2019)
`@renovate-bot` modified `src/service/owners-impl.js:95-95` in [#27350](https://github.com/ampproject/amphtml/pull/27350) (Mar 30, 2020)
`@dvoytenko` modified `extensions/amp-consent/0.1/consent-ui.js:366-392` in [#32480](https://github.com/ampproject/amphtml/pull/32480) (Feb 8, 2021)
`@dvoytenko` modified `extensions/amp-consent/0.1/amp-consent.js:168-181` in [#32480](https://github.com/ampproject/amphtml/pull/32480) (Feb 8, 2021)
`@dvoytenko` modified `src/service/resource.js:1119-1125` in [#6575](https://github.com/ampproject/amphtml/pull/6575) (Dec 9, 2016)
`@dvoytenko` modified `src/utils/signals.js:57-70` in [#7240](https://github.com/ampproject/amphtml/pull/7240) (Jan 30, 2017)
`@avimehta` modified `src/visibility-state.js:1-48` in [#3371](https://github.com/ampproject/amphtml/pull/3371) (Jun 2, 2016)
`@avimehta` modified `src/visibility-state.js:1-48` in [#3371](https://github.com/ampproject/amphtml/pull/3371) (Jun 2, 2016)
`@dvoytenko` modified `src/service/task-queue.js:43-95` in [#3544](https://github.com/ampproject/amphtml/pull/3544) (Jun 14, 2016)
`@muxin` modified `src/service/resources-impl.js:751-754` in [#7327](https://github.com/ampproject/amphtml/pull/7327) (Feb 17, 2017)
`@dvoytenko` modified `src/input.js:27-45` in [#226](https://github.com/ampproject/amphtml/pull/226) (Sep 18, 2015)
`@cramforce` modified `src/pass.js:94-94` in [#3904](https://github.com/ampproject/amphtml/pull/3904) (Jul 6, 2016)
`@renovate-bot` modified `src/service/timer-impl.js:121-121` in [#27350](https://github.com/ampproject/amphtml/pull/27350) (Mar 30, 2020)

**Seen in:**
- 03-04 Nightly (0444)

**Possible assignees:** `@rcebulko`, `@dvoytenko`

/cc @ampproject/release-on-duty