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', 'f2lpv0bcps5ovtb62tomt92m35', '54.224.166.141', '1537657658', '1537657658', '/catalog/allprods.php?osCsid=k6ul4kqnnpnd1l50rcj4ta5g81')

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