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', 'll1bm91mgd7hc9af62mheflor1', '54.156.39.245', '1539609851', '1539609851', '/catalog/product_info.php?name=Phi%20Beta%20Sigma%20License%20Plate%20-%20MCLP_2009&products_id=739')

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