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', 'ib9t96hh0rcjjc6cdvekem2ot7', '18.232.171.18', '1566446394', '1566446394', '/product_info.php?info=p102909_Maerklin-44216--Kuehlwagen-in-Coca-Cola--Gestaltung-H0-AC.html')

[XT SQL Error]