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', '5ti9p58h0q089pp81903o1c8o7', '18.220.57.185', '1738995574', '1738995574', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c1320_LiFePo4-Akkus.html')

[XT SQL Error]