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', 'jjbbr1eumq0uj90a8dn5iki5f2', '54.162.239.233', '1537826572', '1537826572', '/catalog/product_info.php?products_id=152&osCsid=ebmof5e6gh12ojud0o6ic2bbd5')

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