Similar to T33759: Undefined property notice in querypages API (?)
exception.file /srv/mediawiki/php-1.34.0-wmf.8/includes/api/ApiQueryQueryPage.php:125 exception.message PHP Notice: Undefined property: stdClass::$value exception.trace #0 /srv/mediawiki/php-1.34.0-wmf.8/includes/api/ApiQueryQueryPage.php(125): MWExceptionHandler::handleError(integer, string, string, integer, array, array) #1 /srv/mediawiki/php-1.34.0-wmf.8/includes/api/ApiQueryQueryPage.php(53): ApiQueryQueryPage->run() #2 /srv/mediawiki/php-1.34.0-wmf.8/includes/api/ApiQuery.php(249): ApiQueryQueryPage->execute() #3 /srv/mediawiki/php-1.34.0-wmf.8/includes/api/ApiMain.php(1595): ApiQuery->execute() #4 /srv/mediawiki/php-1.34.0-wmf.8/includes/api/ApiMain.php(531): ApiMain->executeAction() #5 /srv/mediawiki/php-1.34.0-wmf.8/includes/api/ApiMain.php(502): ApiMain->executeActionWithErrorHandling() #6 /srv/mediawiki/php-1.34.0-wmf.8/api.php(87): ApiMain->execute() #7 /srv/mediawiki/w/api.php(3): include(string) #8 {main} exception_id XQOWfApAEDQAAHhRBggAAABM exception_url /w/api.php?action=query&list=querypage&qppage=IndexPages&format=json&qplimit=500&qpoffset=500