1366 - Incorrect integer value: '' for column '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', 'f52ae0683632070aec89eaf79c8320a0', '18.119.104.238', '1713513941', '1713513941', '/product_info.php/info/p10_Kleehonig--Wei-klee-.html')

[XT SQL Error]