Error happens here:

public function formatResult( $skin, $result ) {
    $title = $this->titleFactory->newFromID( $result->value );
    $out = $this->getLinkRenderer()->makeKnownLink( $title );
    // ...
}

Looks like a result page went away between the query and formatting the result… not sure how to handle this. Seems like something that QueryPage subclasses might have to deal with in general, so probably worth looking at some other classes.

Untagging the services migration, since we think it’s unlikely to be related.

In T279408#6975664, @Lucas_Werkmeister_WMDE wrote:

Error happens here:

public function formatResult( $skin, $result ) {
    $title = $this->titleFactory->newFromID( $result->value );
    $out = $this->getLinkRenderer()->makeKnownLink( $title );
    // ...
}

Looks like a result page went away between the query and formatting the result… not sure how to handle this. Seems like something that QueryPage subclasses might have to deal with in general, so probably worth looking at some other classes.

They do, and they have. Fetching titles at runtime for each result is not something we typically do in such case since that's upto 500 or 5000 db roundtrip queries the page would have to perform (depending on user rights). We usually use a join and LinkCache for this. The UI rendering is typically strike-through, or if there's not enough information for a link, omit.

Change 679744 had a related patch set uploaded (by Bereket teshome; author: Bereket teshome):

[mediawiki/extensions/Wikibase@master] fix type error

https://gerrit.wikimedia.org/r/679744

Change 679744 merged by jenkins-bot:

[mediawiki/extensions/Wikibase@master] Skip trying to format ids that don't exist

https://gerrit.wikimedia.org/r/679744

Change 721530 had a related patch set uploaded (by Addshore; author: Bereket teshome):

[mediawiki/extensions/Wikibase@REL1_36] Skip trying to format ids that don't exist

https://gerrit.wikimedia.org/r/721530

Change 721530 merged by jenkins-bot:

[mediawiki/extensions/Wikibase@REL1_36] Skip trying to format ids that don't exist

https://gerrit.wikimedia.org/r/721530