2013 - Lost connection to MySQL server during query

update whos_online set customer_id = '', full_name = 'Guest', ip_address = '18.224.171.16', time_last_click = '1716501908', last_page_url = '/pub/product_info.php?XTCsid=baa2e0b55dc4d18e166f32e5fec81456&info=p28515_E-BHM104BK.html' where session_id = 'baa2e0b55dc4d18e166f32e5fec81456'

[XT SQL Error]

2006 - MySQL server has gone away

select count(*) as total from sessions where sesskey = 'baa2e0b55dc4d18e166f32e5fec81456'

[XT SQL Error]