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', 'ecmh71chv9vufnobv34e97u220', '18.97.9.171', '1754969060', '1754969060', '/product_info.php?info=p636_806279-Heizstababdeckung-fuer-80--100-Liter-Bruehkessel.html')

[XT SQL Error]