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', '64ltjrro55h38hh7cg0f0eh892', '18.225.55.104', '1738995047', '1738995047', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c1008_LiFePO4-Caravan-Akku---Zubeh--r.html')

[XT SQL Error]