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', 'p41cskaqqnlv99t40pualeocr5', '3.20.238.29', '1747104730', '1747104730', '/product_info.php?info=p47_802295-Siphontraenke.html')

[XT SQL Error]