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', '5u6qfe47q6qvirh4b6d6q4p620', '54.81.196.35', '1534642997', '1534642997', '/catalog/shopping_cart.php?page=1&osCsid=a0j3s6uphni8a77t0e7dcbedm1')

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