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', 'm35t5dbpv24bpuf34roha94rb5', '54.80.93.19', '1534616371', '1534616371', '/catalog/default.php?cPath=54&osCsid=m5hoianmc0q0h3pf88thfu27m5')

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