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', 'a9kdf1jq9g93184ls7ms2b6d13', '54.161.116.225', '1539798578', '1539798578', '/catalog/product_info.php?products_id=149&osCsid=vvadb46eeid02hgl8tvc1bd555')

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