1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', 'b2a4da19d93bb4a665e934e0ca22ee21', '216.73.216.148', '1755552829', '1755552829', '/product_info.php?info=p1551_Aethiopien-Satellitenbild.html')

[XT SQL Error]