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', '0mi2scvaj63kc5o10e4gps81h1', '54.158.199.217', '1537893678', '1537893678', '/catalog/product_info.php?name=Zeta%20Phi%20Beta%20small%20wooden%20Lapel%20Pin%20ZPB_GP&products_id=860')

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