2013 - Lost connection to MySQL server during query

select p2c.categories_id from products p, products_to_categories p2c where p.products_id = '55948' and p.products_status = '1' and p.products_id = p2c.products_id and p2c.categories_id != 0 limit 1

[XT SQL Error]

2006 - MySQL server has gone away

select count(*) as total from sessions where sesskey = 'a931bbe2a3b2f94b686477dd134a536f'

[XT SQL Error]