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', 'uhm6cbpd1utcr8rgdsvu9n7kd7', '54.161.71.87', '1537798628', '1537798628', '/catalog/product_info.php?products_id=159&osCsid=cqrc3ao9htvo07imp1c409rg94')

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