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', 'hoj74f965oo262mo8fohbk3l30', '18.97.9.175', '1745808521', '1745808521', '/product_info.php?info=p21_800215-Schlammsieb-fuer-Elektro-Futterdaempfer-26-Liter.html')

[XT SQL Error]