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', 'vgrbss9ubhb4q8met171973sb1', '54.166.207.223', '1539816820', '1539816820', '/catalog/default.php?cPath=57_60&osCsid=3cfh49ghjlbcdu8gaf42v9hbd0')

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