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', 's33sp6ei2u7fkadpjt3kee6363', '54.161.116.225', '1539891942', '1539891942', '/catalog/product_info.php?products_id=143&osCsid=hr8qpn0kp9gm2rlv3qn8viiqq6')

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