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', 'lgtem4iv5k8igs6q6ue0ufhog6', '18.232.171.18', '1566441575', '1566441575', '/product_info.php?info=p104021_DR4018-16-kanal-Schaltdecoder.html')

[XT SQL Error]