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', '4qb8k6v6qkgmpm55t89qum9uh6', '54.224.166.141', '1537626703', '1537626703', '/catalog/allprods.php?osCsid=mgtbnmhklabenbfik9u1i8hg90')

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