1366 - Incorrect integer value: '' for column `hbl_shop`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '93r64lcfu9hae3mkb88ri4t3e4', '216.73.216.47', '1758172853', '1758172853', '/product_info.php?info=p72_802134-Handpresse--lebensmittelecht.html')

[XT SQL Error]