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', 'po9vq21f3t3rsns8lv02ngeuq1', '54.158.208.189', '1539629281', '1539629281', '/catalog/shopping_cart.php?osCsid=lfo15fhilvjippiq31j8bqdrq2')

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