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', 'mt6lrhibsubc0inl2r5sbahhp7', '18.232.171.18', '1566444266', '1566444266', '/product_info.php?info=p105171_Fleischmann-826810---3-tlg--Set---8222-Holzzug--8220--mit-Rungenwagen--OeBB-N-Spur.html')

[XT SQL Error]