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', '50kacj17reg6b8okd11j0mqpp5', '54.224.247.42', '1539955400', '1539955400', '/catalog/product_info.php?products_id=431&osCsid=69s2o5vsnj837ojvf60enmonk3')

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