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', 'pqmt4mb8udtgp0svr474n3rfk1', '54.156.39.245', '1539608915', '1539608915', '/catalog/product_info.php?name=Omega%20Psi%20Ph%20Leather%20Back%20Keychain&products_id=887')

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