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', '5cvt3b5atcnc3hg38vdvthmgk2', '54.162.159.33', '1537512228', '1537512228', '/catalog/checkout_confirmation.php?osCsid=mna83sjl2mgpbbpjba6oice863')

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