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', 'c4l9lpnufe97bjs58qd9e3aon1', '54.80.87.166', '1539617088', '1539617088', '/catalog/default.php?cPath=50_133&osCsid=f62shlfskne3do8teahtieije5')

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