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', '1e9ogcrk7cv0h6r5vvmln9h3a1', '18.216.142.94', '1738999700', '1738999700', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c599_Hitachi-Werkzeug-Akku.html')

[XT SQL Error]