mozilla / mozilla/probe-scraper
TypeError exceptions on missing version values
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- Dominant language
- Python
- Stars
- 26
- Forks
- 73
- Avg merge
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- Merged PRs (30d)
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Description
Initially reported by @rtestard.
Currently https://probes.telemetry.mozilla.org/ results in a blank page (for some) after loading finishes.
This is probably due to these exceptions visible in the web console:
TypeError: "can't access property "version", e[a][n.last] is undefined"
E utils.js:17
y utils.js:60
S searchResultsRow.jsx:41
React 6
unstable_runWithPriority scheduler.production.min.js:18
React 6
value main.jsx:451
exports spread.js:25
react-dom.production.min.js:196:194
TypeError: "can't access property "version", e[a][n.last] is undefined"
E utils.js:17
y utils.js:60
S searchResultsRow.jsx:41
React 6
unstable_runWithPriority scheduler.production.min.js:18
React 6
value main.jsx:451
exports spread.js:25
react-dom.production.min.js:196:194
TypeError: "can't access property "version", e[a][n.first] is undefined"
E utils.js:9
y utils.js:60
S searchResultsRow.jsx:41
React 6
unstable_runWithPriority scheduler.production.min.js:18
React 6
value main.jsx:451
exports spread.js:25
react-dom.production.min.js:196:194
TypeError: "can't access property "version", e[a][n.first] is undefined"
E utils.js:9
y utils.js:60
S searchResultsRow.jsx:41
React 6
unstable_runWithPriority scheduler.production.min.js:18
React 6
value main.jsx:451
exports spread.js:25
react-dom.production.min.js:196:194
TypeError: "can't access property "version", e[a][n.first] is undefined"
E utils.js:9
y utils.js:60
S searchResultsRow.jsx:41
React 6
unstable_runWithPriority scheduler.production.min.js:18
React 6
value main.jsx:451
exports spread.js:25
react-dom.production.min.js:196:194
TypeError: can't access property "version", e[a][n.last] is undefined
utils.js:17:26
Initially most of the loaded files from the probe info service were cached (getting HTTP 304), but I also forced to clear the cache ("Disable cache" in the firefox devtools' network tab), so it seems to persist for the current set of data.
At the very least we should handle missing values better in the frontend.
At best we also fix the backend to not miss these values.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with utils.js at lines 9 and 17 and searchResultsRow.jsx at line 41, following the reported stack trace from the page rendering path. Reproduce the blank page at probes.telemetry.mozilla.org with missing version data and verify that the frontend no longer throws when those values are absent; investigate the backend only if the frontend evidence points there.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, react
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100