Problem With Document General

[batalhadematos]

Hi all,
I am having a problem to register new products for the Document General product type.

When I try to save it, I get the following error:

"1366 Incorrect integer value: '' for column 'products_priced_by_attribute' at row 1
in:
[update products set products_quantity = '0', products_type = '3', products_model = '', products_price = '0', products_date_available = null, products_weight = '0', products_status = '1', products_virtual = '0', products_tax_class_id = '0', manufacturers_id = '0', products_quantity_order_min = '1', products_quantity_order_units = '1', products_priced_by_attribute = '', product_is_free = '0', product_is_call = '0', products_quantity_mixed = '', product_is_always_free_shipping = '0', products_qty_box_status = '', products_quantity_order_max = '', products_sort_order = '0', products_discount_type = '0', products_discount_type_from = '0', products_price_sorter = '0.0000', products_image = '', products_last_modified = now(), master_categories_id = '63' where products_id = '167']
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"

I have also tried on the demo database and the same error happens. Even if I try to edit the Test Document from the demo database, the error keeps apearing.

What could be the error?

Sorry for the english

Paulo