1366 - Incorrect integer value: '' for column `CP_as15`.`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', 'r2c2som80ckot51530lea4m5g0', '3.15.177.45', '1738997682', '1738997682', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c771_Wireless-Router-Akku.html')

[XT SQL Error]