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', '5ds7m3tive2snl75rf5tkfduq7', '54.198.23.251', '1537409383', '1537409383', '/catalog/product_info.php?name=Omega%20Psi%20Phi%20Domed%20Paddle%20560&products_id=878')

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