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', 'aqb4r5avhepj43f7r13sbfk7i6', '54.80.102.170', '1534597229', '1534597229', '/catalog/product_info.php?products_id=431&osCsid=m2ng317op404jsb84jd0elveq1')

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