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', 'v2mtq1v18cjmltkfjtp2rp8q61', '54.158.199.217', '1537893558', '1537893558', '/catalog/shopping_cart.php?osCsid=805mnhtgl18pa4053m3pd2m380')

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