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', '9mio1pon9mobd6h37v0qhevlq1', '54.224.89.34', '1539651907', '1539651907', '/catalog/product_info.php?products_id=762&osCsid=4iuvmru6cgiufe33qdr01vgre1')

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