2013 - Lost connection to MySQL server during query

SELECT max(quantity) as qty FROM personal_offers_by_customers_status_1 WHERE products_id='35215' AND quantity<='1'

[XT SQL Error]

2006 - MySQL server has gone away

select count(*) as total from sessions where sesskey = 'aefa5e1bc0a1d61c30e9a55d6a72a7c3'

[XT SQL Error]