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', '28ssld9cclh8f8l0fbp5q5rsr7', '54.198.15.20', '1540047993', '1540047993', '/catalog/contact_us.php?osCsid=gh2oddf83t2mnoua4rn4majo60')

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