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', '5a1dour3kno76r28m22ebsetk5', '54.80.87.166', '1540315351', '1540315351', '/catalog/products_new.php?page=6&osCsid=lf8ufhp2v1cgdhc25n3hqsrh31')

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