Bug: Intermittent browser_bug631374_tags_selector_scroll.js | Uncaught exception - at chrome://*/browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js:9 - TypeError: can't access property "getBoundingClientRect", item is undefined
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2021-04-14 05:52:26+00:00
Resolved: 2022-07-12 17:02:55+00:00

**Filed by:** btara [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=336447650&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/WrwnlLo5T6uQQgmkMYQ7rA/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2021-04-14T04:53:40.126Z] 04:53:40     INFO - TEST-START | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js
[task 2021-04-14T04:53:40.319Z] 04:53:40     INFO - GECKO(6929) | Waiting for browser load
[task 2021-04-14T04:53:40.321Z] 04:53:40     INFO - GECKO(6929) | Waiting for browser state change
[task 2021-04-14T04:53:40.339Z] 04:53:40     INFO - GECKO(6929) | Saw state 110001 and status 0
[task 2021-04-14T04:53:40.395Z] 04:53:40     INFO - GECKO(6929) | Saw state c0010 and status 0
[task 2021-04-14T04:53:40.396Z] 04:53:40     INFO - GECKO(6929) | Browser got expected state change about:buildconfig
[task 2021-04-14T04:53:41.065Z] 04:53:41     INFO - TEST-INFO | started process screentopng
[task 2021-04-14T04:53:41.640Z] 04:53:41     INFO - TEST-INFO | screentopng: exit 0
[task 2021-04-14T04:53:41.641Z] 04:53:41     INFO - Buffered messages logged at 04:53:40
[task 2021-04-14T04:53:41.642Z] 04:53:41     INFO - Entering test bound 
[task 2021-04-14T04:53:41.643Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | gEditItemOverlay is in context - 
[task 2021-04-14T04:53:41.644Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | gEditItemOverlay is initialized - 
[task 2021-04-14T04:53:41.644Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.645Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 8 - 
[task 2021-04-14T04:53:41.646Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position did not change - 
[task 2021-04-14T04:53:41.646Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.646Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is unchecked 8 - 
[task 2021-04-14T04:53:41.646Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Correct tag is still selected - 
[task 2021-04-14T04:53:41.647Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position did not change - 
[task 2021-04-14T04:53:41.647Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.647Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 10 - 
[task 2021-04-14T04:53:41.647Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position did not change - 
[task 2021-04-14T04:53:41.648Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.648Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is unchecked 10 - 
[task 2021-04-14T04:53:41.650Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Correct tag is still selected - 
[task 2021-04-14T04:53:41.650Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position did not change - 
[task 2021-04-14T04:53:41.650Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.650Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 12 - 
[task 2021-04-14T04:53:41.651Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position did not change - 
[task 2021-04-14T04:53:41.661Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.661Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is unchecked 12 - 
[task 2021-04-14T04:53:41.661Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Correct tag is still selected - 
[task 2021-04-14T04:53:41.661Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position did not change - 
[task 2021-04-14T04:53:41.661Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.662Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 13 - 
[task 2021-04-14T04:53:41.662Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position is correct - 
[task 2021-04-14T04:53:41.662Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.663Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is checked 13 - 
[task 2021-04-14T04:53:41.663Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | The next tag is now selected - 
[task 2021-04-14T04:53:41.663Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.663Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 11 - 
[task 2021-04-14T04:53:41.663Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position is correct - 
[task 2021-04-14T04:53:41.663Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.664Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is checked 11 - 
[task 2021-04-14T04:53:41.664Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | The next tag is now selected - 
[task 2021-04-14T04:53:41.664Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.664Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 9 - 
[task 2021-04-14T04:53:41.665Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position is correct - 
[task 2021-04-14T04:53:41.665Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.665Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is checked 9 - 
[task 2021-04-14T04:53:41.666Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | The next tag is now selected - 
[task 2021-04-14T04:53:41.667Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.668Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 7 - 
[task 2021-04-14T04:53:41.670Z] 04:53:41     INFO - Buffered messages logged at 04:53:41
[task 2021-04-14T04:53:41.671Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position is correct - 
[task 2021-04-14T04:53:41.671Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.671Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is checked 7 - 
[task 2021-04-14T04:53:41.671Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | The next tag is now selected - 
[task 2021-04-14T04:53:41.679Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.680Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 5 - 
[task 2021-04-14T04:53:41.680Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position is correct - 
[task 2021-04-14T04:53:41.681Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.683Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is checked 5 - 
[task 2021-04-14T04:53:41.687Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | The next tag is now selected - 
[task 2021-04-14T04:53:41.687Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.689Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 3 - 
[task 2021-04-14T04:53:41.689Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Scroll position is correct - 
[task 2021-04-14T04:53:41.689Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid new listItem found - 
[task 2021-04-14T04:53:41.691Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | New listItem is checked 3 - 
[task 2021-04-14T04:53:41.691Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | The next tag is now selected - 
[task 2021-04-14T04:53:41.691Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Valid listItem found - 
[task 2021-04-14T04:53:41.693Z] 04:53:41     INFO - TEST-PASS | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Item is checked 1 - 
[task 2021-04-14T04:53:41.693Z] 04:53:41     INFO - Buffered messages finished
[task 2021-04-14T04:53:41.696Z] 04:53:41     INFO - TEST-UNEXPECTED-FAIL | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | Uncaught exception - at chrome://mochitests/content/browser/browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js:9 - TypeError: can't access property "getBoundingClientRect", item is undefined
[task 2021-04-14T04:53:41.696Z] 04:53:41     INFO - Stack trace:
[task 2021-04-14T04:53:41.698Z] 04:53:41     INFO - scrolledIntoView@chrome://mochitests/content/browser/browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js:9:18
[task 2021-04-14T04:53:41.698Z] 04:53:41     INFO - @chrome://mochitests/content/browser/browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js:148:8
[task 2021-04-14T04:53:41.698Z] 04:53:41     INFO - Leaving test bound 
[task 2021-04-14T04:53:41.699Z] 04:53:41     INFO - GECKO(6929) | MEMORY STAT | vsize 3444MB | residentFast 534MB | heapAllocated 240MB
[task 2021-04-14T04:53:41.699Z] 04:53:41     INFO - TEST-OK | browser/components/places/tests/browser/browser_bug631374_tags_selector_scroll.js | took 1074ms
[task 2021-04-14T04:53:41.701Z] 04:53:41     INFO - checking window state```