A fatal MySQL error occurred.

Query:
SELECT pmd_menu_links.*, IF(pmd_menu_links.page_id != 0, IF(1, CONCAT('http://ugbiz.ru/pages/',friendly_url,'.html'), CONCAT('http://ugbiz.ru/page.php?id=',pmd_pages.id) ), IF(INSTR(link,'://'), link, CONCAT('http://ugbiz.ru/',link) ) ) as url, target FROM pmd_menu_links LEFT JOIN pmd_pages ON pmd_menu_links.page_id=pmd_pages.id WHERE parent_id=0 AND active=1 AND logged_out=1 ORDER BY ordering

Error:
(2006) MySQL server has gone away

A fatal MySQL error occurred.

Query:
REPLACE INTO pmd_sessions VALUES ('tgth2f9tfhel7dg2qgkldv1me1','initiated|b:1;',1752243917,'cc924e01c4fd668ce79a7a675d996508')

Error:
(2006) MySQL server has gone away