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', '7qq9h1vfjqbrkuqm3fa1mnsid2', '54.161.116.225', '1540209182', '1540209182', '/catalog/product_info.php?name=Phi%20Beta%20Sigma%20License%20Plate%20-%20STFBG_6309&products_id=753')

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