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

SELECT tag_id, COUNT(DISTINCT(it.image_id)) AS counter
  FROM piwigo_image_category ic
    INNER JOIN piwigo_image_tag it
    ON ic.image_id=it.image_id
  WHERE 1=1
   AND  (category_id NOT IN (2052,2053,2056,2111,1821,1824,2123,1818,1819,2017,1869,1882,1884,1887,1899,1902,1904,1905,1906,1908,1915,1918,1919,1921,1922,1924,1930,1931,1935,1936,1939,1940,1944))
  GROUP BY tag_id
; in /home/users4/s/sbouilland/www/Photos/include/dblayer/functions_mysqli.inc.php on line 847

Fatal error: Uncaught Error: Call to a member function fetch_assoc() on bool in /home/users4/s/sbouilland/www/Photos/include/dblayer/functions_mysqli.inc.php:895 Stack trace: #0 /home/users4/s/sbouilland/www/Photos/include/functions_tag.inc.php(68): query2array('\nSELECT tag_id,...', 'tag_id', 'counter') #1 /home/users4/s/sbouilland/www/Photos/include/menubar.inc.php(178): get_available_tags() #2 /home/users4/s/sbouilland/www/Photos/include/menubar.inc.php(15): initialize_menu() #3 /home/users4/s/sbouilland/www/Photos/index.php(103): include('/home/users4/s/...') #4 {main} thrown in /home/users4/s/sbouilland/www/Photos/include/dblayer/functions_mysqli.inc.php on line 895


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

REPLACE INTO piwigo_sessions
  (id,data,expiration)
  VALUES('0383fbe7ace8e3e2970d6e3a973a0e663e51','pwg_device|s:7:\"desktop\";',now())
; in /home/users4/s/sbouilland/www/Photos/include/dblayer/functions_mysqli.inc.php on line 847