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', '6rg5pertf9mqtcg4ra78poceo7', '54.156.51.193', '1537313157', '1537313157', '/catalog/product_info.php?name=Omega%20Psi%20Phi%20Plastic%20License%20Plate%20-%20PFWF_4308&products_id=818')

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