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', 'ap1lrgnq4dvgi1gbnhvkmvb4d0', '216.73.216.217', '1751517615', '1751517615', '/product_info.php?info=p24_Ersatz-Einsatz-fuer-E-Futterdaempfer-26l--inkl--Deckel-und-Schlamm.html')

[XT SQL Error]