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', 'a792de4c3dac6453e895d7f82dce62d0', '3.141.41.187', '1714155698', '1714155698', '/index.php/cat/c4_Met---Baerenfang.html')

[XT SQL Error]