I received the following error when attempting to update to 2.5.1
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A Database Error Occurred
Error Number: 1054
Unknown column ‘ref_ip’ in ‘exp_comments’
ALTER TABLE `exp_comments` CHANGE `ref_ip` `ref_ip` varchar(45)
Filename: /server_path/system/expressionengine/modules/referrer/upd.referrer.php
Line Number: 162
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The error occurs imediately after clicking submit on the license agreement page of the installer.
I’ve since reverted back to 2.5.0