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', 'qjjp2nu4j1jnqr2hth9nivjmi0', '18.191.212.245', '1739001005', '1739001005', '/index.php?XTCsid=u26kusssenv9nf8n7cr2rtvfn3&cat=c704_Mafell-Werkzeug-Akku.html')

[XT SQL Error]