Attempting to edit a public deploy key in admin area results in 404 error

Steps to reproduce:

Click on the title of an existing public deploy key in the admin area. The URL shown after clicking on a title is:

https://my.gitlab.host/admin/deploy_keys/9

Oddly enough, I can add and remove deploy keys, but I just can't edit them

I'm using GitLab 7.12.0 (baa699a7).

Expected behaviour:

Displays web page that allows you to edit the title and key fields of a deploy key.

Observed behaviour:

Displays the GitLab 404 error page.

Log output:

This is the output from my production log file:

Started GET "/admin/deploy_keys/9" for 127.0.0.1 at 2015-06-24 10:07:14 +0100
Processing by NamespacesController#show as HTML
  Parameters: {"id"=>"admin/deploy_keys/9"}
Completed 404 Not Found in 24ms (Views: 0.7ms | ActiveRecord: 5.5ms)

mentioned in merge request !884 (closed)

Thanks for the bug report. Proposed fix here: !884 (closed)

mentioned in merge request !923 (merged)

Status changed to closed by commit b643fa16

mentioned in issue #25972 (closed)

mentioned in merge request !14785