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', '3p523bunbd1l2abqsp3pv4dba6', '54.80.87.166', '1539613876', '1539613876', '/catalog/contact_us.php?osCsid=ldt43h81tpv9sokqvu1eu93f65')

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