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', 'u87666dvm9qqpma40nb9bsflm1', '54.92.163.105', '1540149590', '1540149590', '/catalog/shipping.php?osCsid=miv632dg05tj7q93u4rolmks73')

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