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', 'ouc9bfi07lkpa9ne03p9eh6fp3', '54.225.26.44', '1539862555', '1539862555', '/catalog/product_info.php?products_id=975&osCsid=fi3q87k6gumoh4s3gu3insgm92')

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