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', 'elhe55k9ctkcsd6jf4m5ooj1c6', '18.97.14.91', '1763397448', '1763397448', '/product_info.php?info=p4_Futterdaempfer-Gr--63---100---Liter-silberf--beschichtet.html')

[XT SQL Error]