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', 'eojm5t897tdkgsh3g9dgg27954', '18.232.171.18', '1566445247', '1566445247', '/product_info.php?info=p105132_Fleischmann-739394---Elektrolokomotive-1293-018-8---8222-500th-Loco-for-OeBB--8223---OeBB-Sound-N-Spur.html')

[XT SQL Error]