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', '9br4lve09hp0no579s75520mm2', '54.224.56.126', '1540285583', '1540285583', '/catalog/default.php?osCsid=1t863ptb802m8k05ktjfcenb32')

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