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', '6r48iso1lmev8cg6ojjsho71o0', '3.15.190.49', '1746931928', '1746931928', '/product_info.php?info=p23_Elektro-Futterdaempfer-26-Liter.html')

[XT SQL Error]