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', '8kjfpge21oc0f7o83dt0h6lmi4', '54.198.142.121', '1537417031', '1537417031', '/catalog/product_info.php?products_id=976&osCsid=jafi5mujpkmu3k6k2poeokfii4')

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