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', 'ser801ler29f7ffs5m2dcr8i40', '3.129.23.151', '1739000835', '1739000835', '/index.php?XTCsid=phknodh461cpg07ie5v3k6t3b7&cat=c509_Fahrrad---E-Bike-Akkus.html')

[XT SQL Error]