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', '5f16tl7tpqar0qulechq1mp8u4', '54.158.208.189', '1540266849', '1540266849', '/catalog/default.php?cPath=54&osCsid=9rrm7krdqon5m34tmh1sd927t6')

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