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', 'mukr67ajt9ri560mahe6ttae40', '54.225.38.2', '1534809500', '1534809500', '/catalog/product_info.php?name=Omega%20Psi%20Phi%20Mirror%20Heart%20Keychain%20MHK&products_id=880')

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