When I use Picard's "Add Cluster as Release" plugin on a specific album, the musicbrainz's website displays the following error:

Error:

Caught exception in MusicBrainz::Server::Controller::ReleaseEditor::Add->add "Not an ARRAY reference at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1627, line 17."
Stack trace:
line 1627 MusicBrainz::Server::Wizard::ReleaseEditor
line 314 MusicBrainz::Server::Wizard
line 131 MusicBrainz::Server::Wizard
line 93 MusicBrainz::Server::Wizard::ReleaseEditor
line 20 MusicBrainz::Server::Controller::ReleaseEditor::Add
line 326 MusicBrainz::Server
line 300 MusicBrainz::Server
line 327 MusicBrainz::Server
line 341 MusicBrainz::Server
line 386 MusicBrainz::Server
Request data:

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

Unknown macro: { 'mediums.-1.track.0.artist_credit.names.0.name' => 'Manormouse', 'mediums.-1.track.2.name' => 'High State', 'mediums.-1.track.3.name' => 'Shoot', 'mediums.-1.track.2.artist_credit.names.0.name' => 'Manormouse', 'mediums.-1.track.0.name' => '13th Floor', 'mediums.-1.track.1.name' => 'Superstitious', 'mediums.-1.track.4.name' => 'Low On Ice', 'mediums.-1.track.4.length' => '296264', 'mediums.-1.track.3.artist_credit.names.0.name' => 'Manormouse', 'name' => 'Never Fully Recovered EP', 'mediums.-1.track.1.length' => '181241', 'mediums.-1.track.4.artist_credit.names.0.name' => 'Manormouse', 'mediums.-1.track.0.length' => '262569', 'mediums.-1.track.2.length' => '196066', 'mediums.-1.track.3.length' => '239862', 'mediums.-1.track.1.artist_credit.names.0.name' => 'Manormouse', 'artist_credit.names.0.artist.name' => '' }

};

Host: pingu

URL: http://musicbrainz.org/release/add

I've tested this in both Firefox and Chromium.

I've used that plugin successfully before with other releases.