1366 - Incorrect integer value: '' for column `hbl_shop`.`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', 'bjbaevu3g5m7qldpf7t8laqu23', '216.73.216.34', '1768442517', '1768442517', '/product_info.php?info=p502_804954-Elektrische-Getreidemuehle--lebensmittelecht.html')

[XT SQL Error]