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', 'uijf8eta9ctnmc7qt1f4fhrb17', '3.15.149.154', '1747106886', '1747106886', '/index.php?cat=c20_Kataloge.html')

[XT SQL Error]