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class.udb.php:186 MySQL server has gone away

SELECT `articles`.`nid`, `articles`.`articleTitle`, `articles`.`picture`, `articles`.`shortDesc`, IF(selectArtID IS NULL,0,1) AS selectedArticle
FROM articles
LEFT JOIN selecteArticles ON (selecteArticles.selectArtID = articles.nid AND selecteArticles.currentArtID=18315)
WHERE `articles`.`ifShow`=1
ORDER BY selectedArticle DESC , RAND() LIMIT 4
1: class.udb.php:315 udb::query()
2: class.udb.php:309 udb::single_list()
3: inc_magazine.php:55 udb::full_list()
4: index.php:879 include()