1366 - Incorrect integer value: '' for column `abtecsho_shop`.`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', 't998tpknnhs2ikrp4nt7me39h7', '216.73.216.22', '1768705219', '1768705219', '/product_info.php/info/p6927_ISO-7010--Brandschutzordnung-DIN-14096--Teil-A-.html')

[XT SQL Error]