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', 'g8q60dnnj5moerpp6jj6q4s1v2', '18.188.209.71', '1738997301', '1738997301', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c1008_LiFePO4-Caravan-Akku---Zubeh--r.html')

[XT SQL Error]