Viewing the page for a tag which is only present on works gives a internal server error for template

My example page: http://musicbrainz.org/tag/jasrac

Error:

Couldn't render template "undef error - Can't find action for path '/tag_work' at /home/musicbrainz/musicbrainz-server/root/tag/index.tt line 19 "

Stack trace:
line 16 MusicBrainz::Server::View::Default
line 251 MusicBrainz::Server
Request data:

$VAR1 = {
'query_parameters' => {},
'body_parameters' => {}
};