TypeError: Return value of CoreTagHooks::gallery() must be of the type string, array returned

[kghbln]

Setup

• MediaWiki | 1.39.7 (64425c7)16:12, 15 May 2024
• PHP | 7.4.33 (apache2handler)
• MariaDB | 10.5.23-MariaDB-0+deb11u1
• Elasticsearch | 7.10.2
• Semantic MediaWiki 4.1.3

Issue

Happening on https://sandbox.semantic-mediawiki.net/

Then running php extensions/SemanticMediaWiki/maintenance/rebuildData.php -v --ignore-exceptions --with-maintenance-log:

updating 2953      [T: BootstrapComponents/Well]
[9e4520696d2e1dab9704b1ef] [no req]   TypeError: Return value of CoreTagHooks::gallery() must be of the type string, array returned

or

   ... updating 22741     [S: BootstrapComponents/Well]
[35da4ada9997a1bf9a957bbe] [no req]   TypeError: Return value of CoreTagHooks::gallery() must be of the type string, array returned

Backtrace:

from /../w/includes/parser/CoreTagHooks.php(177)
#0 /../w/includes/parser/Parser.php(4019): CoreTagHooks::gallery()
#1 /../w/includes/parser/PPFrame_Hash.php(353): Parser->extensionSubstitution()
#2 /../w/includes/parser/Parser.php(2953): PPFrame_Hash->expand()
#3 /../w/includes/parser/Parser.php(1609): Parser->replaceVariables()
#4 /../w/includes/parser/Parser.php(723): Parser->internalParse()
#5 /../w/includes/content/WikitextContentHandler.php(301): Parser->parse()
#6 /../w/includes/content/ContentHandler.php(1721): WikitextContentHandler->fillParserOutput()
#7 /../w/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput()
#8 /../w/extensions/SemanticMediaWiki/includes/ContentParser.php(168): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput()
#9 /../w/extensions/SemanticMediaWiki/includes/ContentParser.php(130): SMW\ContentParser->fetchFromContent()
#10 /../w/extensions/SemanticMediaWiki/src/MediaWiki/Jobs/UpdateJob.php(199): SMW\ContentParser->parse()
#11 /../w/extensions/SemanticMediaWiki/src/MediaWiki/Jobs/UpdateJob.php(139): SMW\MediaWiki\Jobs\UpdateJob->parse_content()
#12 /../w/extensions/SemanticMediaWiki/src/MediaWiki/Jobs/UpdateJob.php(94): SMW\MediaWiki\Jobs\UpdateJob->doUpdate()
#13 /../w/extensions/SemanticMediaWiki/src/SQLStore/Rebuilder/Rebuilder.php(247): SMW\MediaWiki\Jobs\UpdateJob->run()
#14 /../w/extensions/SemanticMediaWiki/src/Maintenance/DataRebuilder.php(472): SMW\SQLStore\Rebuilder\Rebuilder->rebuild()
#15 /../w/extensions/SemanticMediaWiki/src/Maintenance/DataRebuilder.php(385): SMW\Maintenance\DataRebuilder->doUpdateById()
#16 /../w/extensions/SemanticMediaWiki/src/Maintenance/DataRebuilder.php(224): SMW\Maintenance\DataRebuilder->rebuildAll()
#17 /../w/extensions/SemanticMediaWiki/maintenance/rebuildData.php(198): SMW\Maintenance\DataRebuilder->rebuild()
#18 /../w/maintenance/includes/MaintenanceRunner.php(309): SMW\Maintenance\rebuildData->execute()
#19 /../w/maintenance/doMaintenance.php(85): MediaWiki\Maintenance\MaintenanceRunner->run()
#20 /../w/extensions/SemanticMediaWiki/maintenance/rebuildData.php(294): require_once(string)
#21 {main}

The --ignore-exceptions' flag to "rebuildData.php" was not working, so I had to restart rebuilding data manually with the -s` flag.