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', '3e0o761gtrfulllravcn509no3', '54.161.116.225', '1539912441', '1539912441', '/catalog/product_info.php?products_id=480&osCsid=kfmbskckcsq25fe7gh7s2m9dd2')

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