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', '6bge5pt3jq1rji1cck9ddiiav5', '216.73.216.116', '1751333198', '1751333198', '/product_info.php?info=p513_Witwer--Top--Mischung-ohne-Huelsenfruechte-25kg-WT.html')

[XT SQL Error]