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', 'b5e5a8a8b02ebdd45a95200ad9dbbb25', '34.229.24.100', '1563484888', '1563484888', '/product_info.php/info/p808_V-Shirt-Summer-Match.html')

[XT SQL Error]