2013 - Lost connection to MySQL server during query

update whos_online set customer_id = '', full_name = 'Guest', ip_address = '54.226.181.106', time_last_click = '1518917297', last_page_url = '/product_info.php?info=p426_-------------------------------------------NO-JEW012.html&XTCsid=qg48scd9ol5atdh659m0456lq7' where session_id = 'qg48scd9ol5atdh659m0456lq7'

[XT SQL Error]

2006 - MySQL server has gone away

select count(*) as total from sessions where sesskey = 'qg48scd9ol5atdh659m0456lq7'

[XT SQL Error]