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', '9noqjsv5bv68ea78oe773bhcn2', '54.224.166.141', '1537629416', '1537629416', '/catalog/product_info.php?products_id=981&osCsid=k1hgol21gfbtmfed59tsdmoiq1')

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