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', '7u251bfftjk4ldinbgmd1nt2d4', '54.166.207.223', '1539819435', '1539819435', '/catalog/password_forgotten.php?osCsid=pf12o2id5fcu8n8i1od4nkfnu1')

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