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', '74omtn7oh0ab4c69fsum5uddj7', '54.156.51.193', '1537574500', '1537574500', '/catalog/product_info.php?products_id=462&osCsid=5d5b7stavusnqh7na7hrn82410')

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