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Edits made to articles where the title is only a number return wrong results in the new impact module.
Closed, ResolvedPublicBUG REPORT


A newcomer who edited gets in their impact module:

Capture d’écran_2023-01-18_15-08-59.png (218×380 px, 25 KB)

I edited the same article, using my volunteer account, with the same result:

Capture d’écran_2023-01-18_15-24-33.png (417×521 px, 53 KB)

"0" redirects to, and "1" to the article "1".

It does happen for random numbers (tested with
It doesn't happen when the title is numbers followed by text (tested here with and

Capture d’écran_2023-01-18_15-32-51.png (540×603 px, 73 KB)

This problem is not on the old impact module (tested with a new test account, on

20220427_193946-0506f.jpg (299×603 px, 58 KB)

Event Timeline

kostajh triaged this task as Medium priority.Jan 18 2023, 6:17 PM
kostajh changed the subtype of this task from "Task" to "Bug Report".

Thanks, @Trizek-WMF - the issue is confirmed in betalabs.

  1. Import an article, e.g. 1600 (was imported from cawikito enwiki betalabs)
  2. A new user (with zero number of edits ET18oct01) edits 1600. The user made only one edit.
  3. The Impact module will go from zero edits to 1 edit.
Screen Shot 2023-01-18 at 12.28.34 PM.png (866×1 px, 150 KB)
Screen Shot 2023-01-18 at 12.29.40 PM.png (1×1 px, 113 KB)

The bug:

  • the pageview count displays two edits attributed to the wrong articles
  • the page links go to the articles that a user never edited. In my example, 0 -> to non-existing article; 1 -> 1 with no edits from a test user.

Checked other types of titles with numerals - look ok:

Screen Shot 2023-01-18 at 12.44.44 PM.png (1×1 px, 101 KB)

Change 881494 had a related patch set uploaded (by Sergio Gimeno; author: Sergio Gimeno):

[mediawiki/extensions/GrowthExperiments@master] User impact: avoid removing keys in article associative arrays

Change 881494 merged by jenkins-bot:

[mediawiki/extensions/GrowthExperiments@master] User impact: avoid removing keys in article associative arrays

Checked testwiki wmf.22 and eswiki wmf.21 - the issue is fixed:

Screen Shot 2023-02-07 at 4.08.22 PM.png (512×331 px, 39 KB)
Screen Shot 2023-02-07 at 4.04.43 PM.png (393×1 px, 42 KB)