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', '39hlmtduvd48jkmmsj58btmb42', '54.224.247.42', '1539996034', '1539996034', '/catalog/product_info.php?products_id=912&osCsid=agk0q8j7kp97lngs8045f52v72')

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