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', '2ujkfk631g1ctf8npj4itr5o42', '54.162.159.33', '1537511692', '1537511692', '/catalog/product_info.php?products_id=980&osCsid=5faivbopqqr3v8n1efg6sijv17')

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