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', 'c5pe1spdedvkqr20ct5a5vu8a6', '54.80.188.87', '1539999664', '1539999664', '/catalog/shopping_cart.php?osCsid=5o8jf7too8jbrilno6lau0tkh4')

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