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', 'd7j5rpbckn47kv3ap1elhmc6c5', '18.232.171.18', '1566446214', '1566446214', '/product_info.php?info=p103979_Jaegerndorfer-60240-2-teilig-City-Shuttle-Wortmarke-Ep-VI-N-Spur.html')

[XT SQL Error]