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', 'colj9u6j9plipd4ljo9fnde5l6', '54.162.133.222', '1539973034', '1539973034', '/catalog/shopping_cart.php?osCsid=2p0i8nqgtti99mjogk5bv6sq43')

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