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Special:EntityPage for form ID or sense ID results in InvalidArgumentException
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Trying to access the entity page for any form or sense ID via Special:EntityPage (form example, sense example) results in an internal error:

InvalidArgumentException from line 429 of /srv/mediawiki/php-master/extensions/Wikibase/repo/includes/Content/EntityHandler.php: The given ID does not refer to an entity of type lexeme

#0 /srv/mediawiki/php-1.33.0-wmf.3/extensions/Wikibase/repo/includes/Content/EntityContentFactory.php(120): Wikibase\Repo\Content\EntityHandler->getTitleForId(Wikibase\Lexeme\Domain\Model\FormId)
#1 /srv/mediawiki/php-1.33.0-wmf.3/extensions/Wikibase/repo/includes/Specials/SpecialEntityPage.php(64): Wikibase\Repo\Content\EntityContentFactory->getTitleForId(Wikibase\Lexeme\Domain\Model\FormId)
#2 /srv/mediawiki/php-1.33.0-wmf.3/includes/specialpage/SpecialPage.php(569): Wikibase\Repo\Specials\SpecialEntityPage->execute(string)
#3 /srv/mediawiki/php-1.33.0-wmf.3/includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(string)
#4 /srv/mediawiki/php-1.33.0-wmf.3/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#5 /srv/mediawiki/php-1.33.0-wmf.3/includes/MediaWiki.php(862): MediaWiki->performRequest()
#6 /srv/mediawiki/php-1.33.0-wmf.3/includes/MediaWiki.php(517): MediaWiki->main()
#7 /srv/mediawiki/php-1.33.0-wmf.3/index.php(42): MediaWiki->run()
#8 /srv/mediawiki/w/index.php(3): include(string)
#9 {main}


  • Users who try to use Special:EntityPage with a form or sense ID are presented with a generic system error page, effectively stranded. However, we don’t link to such pages anywhere, so it’s not clear how those users would reach the error page in the first place.
  • The server produces a fatal exception, which results in noise and false alarms for operational monitoring. That said, the noise volume is extremely low, see below.
  • The server response is HTTP 500, which cannot cached.


Between 2019-01-01 and 2019-05-28, there hasn’t been a single occurrence of this error in Logstash. (There are some occurrences on 2019-05-29, presumably from users seeing the activity on this task and clicking the links above.)

Event Timeline

Lucas_Werkmeister_WMDE renamed this task from Special:EntityPage for form ID results in InvalidArgumentException to Special:EntityPage for form ID or sense ID results in InvalidArgumentException.Nov 8 2018, 9:41 AM
Lucas_Werkmeister_WMDE updated the task description. (Show Details)
Krinkle updated the task description. (Show Details)EditedMay 29 2019, 3:42 PM
Krinkle added a subscriber: Krinkle.

If the functionality in question is unfinished or not something we can currently support, please consider a short-term fix that disables it gracefully in a way that doesn't produce signals analogous to system instability (which make monitoring hard (and can abort deployments mid-way in confusing ways), and that can be cached (e.g. an error message printed from a catch handler over HTTP 200, or 4xx).

Some permalinks for Wikidata items are consistently unreachable to users. They are presented with a generic system error page, effectively stranded.

@Krinkle I don’t understand this at all. Do you mean items or entities? (Entity is the more general term, covering items, properties, lexicographical entities, and others.) And why permalinks?

Krinkle added a comment.EditedMay 29 2019, 3:48 PM

Do you mean items or entities?

As a user, I am unable to make a distinction between entities and items. Maybe they are items, I don't know.

And why permalinks?

It appears to me that Special:EntityPage is a standard way to create a link to an entity (or item?) based on its identifier. Perhaps similar to Special:Diff and Special:Redirect. I don't know what it's actual use case is, however. But I assume they are used in urls, and that those urls are used by links that users use in a web browser (eg. not an API-like special page for exporting data). I refer to those as permalinks, but perhaps there's a better term.

Feel free to correct as needed. I'm just triaging the errors en-mass.

hoo added a subscriber: hoo.May 29 2019, 3:53 PM

This might be fixed along with T223995 which both might have the same root cause.

mmodell changed the subtype of this task from "Task" to "Production Error".Aug 28 2019, 11:08 PM