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', 'tgg4v8phv7417bmng6co1dqle0', '216.73.216.89', '1767474200', '1767474200', '/product_info.php?info=p461_804817-Wuehlmausschussgeraet.html')

[XT SQL Error]