hashar added a comment.
I have found some other occurrences from WikibaseClient.php, still related to an array keys being an empty string. Both from php 7.2.22-1+0~20190902.26+debian9~1.gbpd64eb7+wmf1 /srv/mediawiki/php-1.34.0-wmf.21/extensions/Wikibase/client/includes/WikibaseClient.php:1591 `PHP Notice: Undefined index: ` #0 /srv/mediawiki/php-1.34.0-wmf.21/extensions/Wikibase/client/includes/WikibaseClient.php(1591): MWExceptionHandler::handleError(integer, string, string, integer, array) #1 /srv/mediawiki/php-1.34.0-wmf.21/extensions/Wikibase/client/includes/WikibaseClient.php(1627): Wikibase\Client\WikibaseClient->getItemTermIndex() #2 /srv/mediawiki/php-1.34.0-wmf.21/extensions/Wikibase/client/WikibaseClient.php(236): Wikibase\Client\WikibaseClient->getDescriptionLookup() #3 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiModuleManager.php(191): {closure}(ApiQuery, string) #4 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiModuleManager.php(167): ApiModuleManager->instantiateModule(string, string, Closure) #5 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiQuery.php(307): ApiModuleManager->getModule(string, string) #6 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiQuery.php(218): ApiQuery->instantiateModules(array, string) #7 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiMain.php(1596): ApiQuery->execute() #8 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiMain.php(534): ApiMain->executeAction() #9 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiMain.php(505): ApiMain->executeActionWithErrorHandling() #10 /srv/mediawiki/php-1.34.0-wmf.21/api.php(86): ApiMain->execute() #11 /srv/mediawiki/w/api.php(3): require(string) #12 {main} And: #0 /srv/mediawiki/php-1.34.0-wmf.21/extensions/Wikibase/client/includes/WikibaseClient.php(1591): MWExceptionHandler::handleError(integer, string, string, integer, array) #1 /srv/mediawiki/php-1.34.0-wmf.21/extensions/Wikibase/client/includes/WikibaseClient.php(1627): Wikibase\Client\WikibaseClient->getItemTermIndex() #2 /srv/mediawiki/php-1.34.0-wmf.21/extensions/Wikibase/client/WikibaseClient.php(236): Wikibase\Client\WikibaseClient->getDescriptionLookup() #3 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiModuleManager.php(191): {closure}(ApiQuery, string) #4 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiModuleManager.php(167): ApiModuleManager->instantiateModule(string, string, Closure) #5 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiQuery.php(307): ApiModuleManager->getModule(string, string) #6 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiQuery.php(218): ApiQuery->instantiateModules(array, string) #7 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiMain.php(1596): ApiQuery->execute() #8 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiMain.php(534): ApiMain->executeAction() #9 /srv/mediawiki/php-1.34.0-wmf.21/includes/api/ApiMain.php(505): ApiMain->executeActionWithErrorHandling() #10 /srv/mediawiki/php-1.34.0-wmf.21/api.php(86): ApiMain->execute() #11 /srv/mediawiki/w/api.php(3): require(string) #12 {main} Both from name=client/includes/WikibaseClient.php 1585 public function getItemTermIndex() { 1586 if ( $this->itemTermIndex === null ) { 1587 $dataAccessSettings = $this->getDataAccessSettings(); 1588 $itemSource = $this->getItemSource( $dataAccessSettings ); 1589 $itemDatabaseName = $dataAccessSettings->useEntitySourceBasedFederation() ? 1590 $itemSource->getDatabaseName() : 1591 $this->getRepositoryDefinitions()->getDatabaseNames()['']; # array with empty string as a key It is different than the one found earlier ( $this->getRepositoryDefinitions()->getConceptBaseUris()[''] ), but related since that is an empty string array key :\ So that is probably the exact same bug as T232613 <https://phabricator.wikimedia.org/T232613> which has the advantage to occur way more frequently. TASK DETAIL https://phabricator.wikimedia.org/T231089 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: hashar Cc: hashar, Joe, Krinkle, Ladsgroup, Lucas_Werkmeister_WMDE, WMDE-leszek, Aklapper, zeljkofilipin, darthmon_wmde, alaa_wmde, DannyS712, Nandana, Lahi, Gq86, Tommy_Kronkvist, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Jonas, Wikidata-bugs, aude, Lydia_Pintscher, Nikerabbit, Jdforrester-WMF, Mbch331, Jay8g, Krenair
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