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', '5qjtd7f6ji299eqi3spn2m0dq2', '54.145.83.79', '1539749911', '1539749911', '/catalog/contact_us.php?osCsid=h17pm4hvki90lv2c0hm3b9o272')

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