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', '1lrjvoi7fcnaglaag2n3ou7pf4', '54.166.203.17', '1537675407', '1537675407', '/catalog/shopping_cart.php?osCsid=45c03tpvv6btrkavhtio2gqgq0')

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