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', '7dj5a2nkt9v6n9mj4u6725aj52', '54.198.205.153', '1537683038', '1537683038', '/catalog/default.php?cPath=29&osCsid=9lukq4o4nukvlhll6frj12ocg7')

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