PP Express SQL Error "2006 MySQL server has gone away"

[serial3dart]

2006 MySQL server has gone away
in:
[select customers_email_format from zen_customers where customers_email_address= 'ricard#####ail.com']
2006 MySQL server has gone away
in:
[select count(*) as total from zen_sessions where sesskey = '238ddab7f83#######3e9d']


I add a product to cart and click on paypal express checkout,and it gives that error any tip ??

You can repruduce the error in Here

[serial3dart]

The email that shows on error is the owner email not the buyer

And it giving the same error on ipn checkout :S