Erreur SQL

QUERY :
SELECT FOUND_ROWS()

INFO :
MySQL server has gone away

STACK TRACE :

#0 /home/izam/public_html/zam/classe/pdo.mysql.php(102): Z_PDOMySQL->show_error('SELECT FOUND_RO...', Array)
#1 /home/izam/public_html/zam/classe/model.php(786): Z_PDOMySQL->query('SELECT FOUND_RO...')
#2 /home/izam/public_html/zam/classe/model.php(668): Z_Model->get_list(Array)
#3 /home/izam/domains/endurancechrono.com/public_html/index.php(156): Z_Model->get('76')
#4 {main}

REQUEST PAGE :
/en/50_km_VERGEZE/13_km?list=cat&num=894

REQUEST POST :

Array
(
)

REQUEST GET :

Array
(
    [list] => cat
    [num] => 894
)