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', 'd8ditho8p37ru7oekv70irth26', '54.80.188.87', '1539848930', '1539848930', '/catalog/shopping_cart.php?osCsid=of6j5v6232eqgemhf7v7vsalr7')

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