Thanks for your suggested fix. I implemented it in the same fashion and it seemed to solve the problem.
However i have recently noticed that this fix seems to have a strange affect on the Prestashop database. In that it is triggers the creation of multiple entries into the ps_employee table using the email set in the fix e.g. [email protected]. Each entry has the first name "Prestashop" and the last name "Marketplace"
Are you getting the same behaviour in your database?
- Rich