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', 'serk8f0s8pstmcu65m8nglege7', '54.161.71.87', '1537369258', '1537369258', '/catalog/product_info.php?products_id=145&osCsid=pvr12ptm86uprbemcivhp1ipj6')

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