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', 'he3a9pb2vf2k4dp03ri8rs9hv6', '54.156.51.193', '1537313997', '1537313997', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20License%20Plate%20--%20DMTG_7107&products_id=950')

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