-// Perform deferred updates.
-$lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
-$lbFactory->commitMasterChanges( $maintClass );
-DeferredUpdates::doUpdates();
+if ( $maintenance->getDbType() !== Maintenance::DB_NONE ) {
+ // Perform deferred updates.
+ $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
+ $lbFactory->commitMasterChanges( $maintClass );
+ DeferredUpdates::doUpdates();
+}