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', 'uqt0hk7i30vc4kcfkkgtfkun45', '54.198.212.30', '1540109658', '1540109658', '/catalog/default.php?cPath=29_233&osCsid=9jn7i7p3pdbo83bud78fjothu4')

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