1366 - Incorrect integer value: '' for column `usr_web74_1`.`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', 'ctqedvcsvgrfc314hmgdbmroe3', '216.73.216.137', '1752305710', '1752305710', '/product_info.php?info=p1914_Trommeltasche-mittel.html')

[XT SQL Error]