You should update your DbQuery.php file.
You can get it from github:
https://github.com/PrestaShop/PrestaShop/pull/7232
https://github.com/PrestaShop/PrestaShop-1.6/blob/master/classes/db/DbQuery.php
Edit History
You should update your DbQuery.php file.
You can get it from github:
https://github.com/PrestaShop/PrestaShop/pull/7232
https://github.com/PrestaShop/PrestaShop/blob/1.6.1.x/classes/db/DbQuery.php