1366 - Incorrect integer value: '' for column `wwwmodellbahn_diskont1`.`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', 'i0urbshaqcdfsosnpgarc00tt1', '18.232.171.18', '1566441446', '1566441446', '/product_info.php?info=p4232_Roco-62868---Diesellokomotive-BR-234-der-DB-AG-mit-Sound.html')

[XT SQL Error]