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', 'ipps9p2kcoqhd4j25fd88oqrm6', '54.225.38.2', '1534809507', '1534809507', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Acrylic%20Medallion%20MED-A&products_id=914')

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