[QUICKFIX] Error on adding / duplicating products

[admin]

Problem:

QuickUpdate v4.0 trhows a "There was an error...." message without specifying which the error actually is, when adding / duplicating products.

Solution (possible):

1. Open the "database.php" file and search for: unset($productData['id_product']);
2. Add the following on the next line after the one found: unset($productData['id_lang']);
3. Save and things might work properly.