Backtrace:
#0 /var/www/elinux.org/htdocs/extensions/LiquidThreads/api/ApiFeedLQTThreads.php(189): Article->__construct(NULL, integer)
#1 /var/www/elinux.org/htdocs/extensions/LiquidThreads/api/ApiFeedLQTThreads.php(58): ApiFeedLQTThreads->getConditions(array, Wikimedia\Rdbms\DatabaseMysqli)
#2 /var/www/elinux.org/htdocs/includes/api/ApiMain.php(1579): ApiFeedLQTThreads->execute()
#3 /var/www/elinux.org/htdocs/includes/api/ApiMain.php(535): ApiMain->executeAction()
#4 /var/www/elinux.org/htdocs/includes/api/ApiMain.php(506): ApiMain->executeActionWithErrorHandling()
#5 /var/www/elinux.org/htdocs/api.php(94): ApiMain->execute()
#6 {main}