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', 'l87tlbehmv0sf7d6ps7p9b0hj1', '54.156.51.193', '1537343549', '1537343549', '/catalog/default.php?osCsid=kuovha5je0p2i5273kh9j8qci2')

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