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', 'lk031qt3807um2ioij3pr42mv6', '3.148.145.124', '1739000744', '1739000744', '/index.php?XTCsid=phknodh461cpg07ie5v3k6t3b7&cat=c216_Metabo-Werkzeug-Akku.html')

[XT SQL Error]