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', 'q8677qkj3jbscenspdd1ir48u4', '3.136.233.79', '1738994561', '1738994561', '/index.php?XTCsid=je9k4v12tkp4tisil6f61oiu11&cat=c937_Satelliten-Zubeh--r.html')

[XT SQL Error]