1366 - Incorrect integer value: '' for column `shop_db3`.`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', '1517557473816fab4df8398577a2560c', '3.145.115.195', '1713947969', '1713947969', '/product_info.php?language=de&info=p248_Memory-Of-Spain.html&XTCsid=f88a86bf4ffc9ff2be90f468933efb62')

[XT SQL Error]