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', '6kao2tlu01ved08qctoo57l3v7', '54.224.56.126', '1539839364', '1539839364', '/catalog/default.php?cPath=48&osCsid=o18emcup1h7favgldi1cstias4')

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