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', '8f30203abada2988c71244d156f3bb6d', '34.229.24.100', '1563486894', '1563486894', '/product_info.php/info/p552_Thong-magical.html')

[XT SQL Error]