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', '0qptf4gmutr8g99kvr6oq56bl6', '54.80.87.166', '1540309095', '1540309095', '/catalog/default.php?cPath=54&osCsid=sg5fb257drs1fjumsps6tvo4v6')

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