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', 'bqlsqd7c9bip67l1lrv9nudmp7', '54.80.140.29', '1534484291', '1534484291', '/catalog/contact_us.php?osCsid=fi3q87k6gumoh4s3gu3insgm92')

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