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', 'f866dec3bc696fc1be236ed48f417ae6', '52.15.63.145', '1714136953', '1714136953', '/index.php')

[XT SQL Error]