When a certificate containing an OU (possibly any other field than CN) is signed. An error occurs when viewing cert list page.

Possibly, the id of the certificate is not parsed correctly and ends up containing a '/' character which is not allowed.

The certificate could be parsed in the manner puppet does it https://github.com/puppetlabs/puppet/blob/master/lib/puppet/util/ssl.rb#L44 to avoid this issue.