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', '8dm1d964s1uiu8ob15gcq5oqr2', '18.191.160.52', '1746945001', '1746945001', '/product_info.php?info=p595_806255-Zeitschaltuhr-SPT-2000.html')

[XT SQL Error]