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', '9cfom7ik2cfnpg7k9p32mvfkv1', '54.161.71.87', '1537283371', '1537283371', '/catalog/product_info.php?products_id=889&osCsid=6mblkm1ovouoq14phqntgp4lh0')

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