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', '0hivd7140d8k85aef3pliu6oo7', '54.81.150.27', '1537291068', '1537291068', '/catalog/product_info.php?products_id=407&osCsid=pgrm7rcj34qh43e2gv3pc5bhe2')

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