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', '192f1b56479777a034fbaf224154ea10', '34.229.24.100', '1563486349', '1563486349', '/index.php/cat/c2_Women.html')

[XT SQL Error]