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', 'gudkum74inphl11euj61t15c46', '54.198.212.30', '1539877444', '1539877444', '/catalog/product_info.php?products_id=438&osCsid=22aoramb9m9dsr5bmf17ig2qc7')

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