patch was free when you have download it
i update null patch to lastest vesrion 1.0.6 ,please download from here and then replace files.
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method:
remov localkey
with phpmyadmin or other run sql to display localkey information.
SQL:
SELECT * FROM `tblconfiguration` WHERE `setting` LIKE 'vultr_vps_localkey' ORDER BY `id` DESC
remove record