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', 'm8sl488nns9lj6589mu9j1v6b2', '54.224.166.141', '1537629584', '1537629584', '/catalog/shopping_cart.php?osCsid=ba7a9u1pmmfvrmeegbfn7dilp0')

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