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', '8ul7q0na5ikqhl6hmkpn11f9t7', '54.158.199.217', '1537280251', '1537280251', '/catalog/product_info.php?products_id=662&osCsid=fbug24oc5fh9d821vbqejo4gq7')

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