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', 'tvavi1shcu5lm6b569ov3174g2', '216.73.216.116', '1751319573', '1751319573', '/product_info.php?info=p462_50-Spezialkartuschen-Kal--9x17.html')

[XT SQL Error]