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', 'nhst8dj8nf79ocjul5bfksh686', '54.161.116.225', '1540211216', '1540211216', '/catalog/product_info.php?name=Omega%20Psi%20Phi%20Key%20Chain%20-%20DKC&products_id=822')

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