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', '2t5pc0gcio4inmauuik45gsqt0', '18.232.171.18', '1566441213', '1566441213', '/product_info.php?info=p103086_Hobbytrain-H2987-E-Lok-BR193-Vectron-OeBB--Ep-VI-SPUR--N.html')

[XT SQL Error]