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', 'h4ma95mqa37tnj2crn1hjgnpg6', '54.224.247.42', '1540200691', '1540200691', '/catalog/product_info.php?name=Phi%20Beta%20Sigma%20Domed%20Paddle%20560&products_id=872')

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