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', 'c79hiitl9ukeo23o4q9jbd7cd7', '54.225.26.44', '1539940829', '1539940829', '/catalog/product_info.php?products_id=593&osCsid=uj7l09po8p0qhagiq3cue7gsn6')

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