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', '0mq65h8u66dqjfar7hj9kd1776', '3.21.92.87', '1738993659', '1738993659', '/index.php?XTCsid=rl82acg8c5l20cikdfeu2s7rt7&cat=c587_Ladeger--t-f--r-Blei-Gel-Akkus.html')

[XT SQL Error]