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', 'hcrmq5jto8mkqjjrn3kb3dm6o0', '18.118.194.15', '1738994618', '1738994618', '/index.php?XTCsid=qg0uqqo4jksa5ns63d51ihq545&cat=c28_MP3-Player-Akku.html')

[XT SQL Error]