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', 'km2632soec2j55u6rka5mf2ft1', '3.15.220.148', '1738993477', '1738993477', '/index.php?XTCsid=qi1463dp261ivpfjuiqmhrofh5&cat=c711_Staubsauger---Rasenm--her-Akku.html')

[XT SQL Error]