Warning:  [mysql error 2006] MySQL server has gone away

SELECT SQL_CALC_FOUND_ROWS com.id AS comment_id,
       com.image_id,
       ic.category_id,
       com.author,
       com.author_id,
       u.mail_address AS user_email,
       com.email,
       com.date,
       com.website_url,
       com.content,
       com.validated
  FROM piwims_image_category AS ic
    INNER JOIN piwims_comments AS com
    ON ic.image_id = com.image_id
    LEFT JOIN piwims_users As u
    ON u.id = com.author_id
  WHERE 1=1
    AND validated='true'
    AND  1 = 1
  GROUP BY comment_id
  ORDER BY date DESC
  LIMIT 10 OFFSET 360190
; in /home/transitionmh/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 847

Warning:  [mysql error 2006] MySQL server has gone away

REPLACE INTO piwims_sessions
  (id,data,expiration)
  VALUES('D849b224c84094c1e0240bf9d98d895c3eef','pwg_device|s:7:\"desktop\";pwg_mobile_theme|b:0;',now())
; in /home/transitionmh/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 847