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', '2uj7504crkc5hoh57jtf4j5hu7', '54.80.188.87', '1539850771', '1539850771', '/catalog/default.php?cPath=56&osCsid=of6j5v6232eqgemhf7v7vsalr7')

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