Got this error while trying to add a medium to a release that has no mediums.

---

Error:

Caught exception in MusicBrainz::Server::Controller::ReleaseEditor::Edit->edit "Can't call method "add_error" on an undefined value at /home/musicbrainz/musicbrainz-server/script/../lib/MusicBrainz/Server/Form/ReleaseEditor/Tracklist.pm line 234."

Stack trace:

line 234 MusicBrainz::Server::Form::ReleaseEditor::Tracklist
line 105 MusicBrainz::Server::Form
line 524 MusicBrainz::Server::Wizard
line 238 MusicBrainz::Server::Wizard
line 173 MusicBrainz::Server::Wizard
line 388 MusicBrainz::Server::Wizard
line 132 MusicBrainz::Server::Wizard
line 91 MusicBrainz::Server::Wizard::ReleaseEditor
line 17 MusicBrainz::Server::Controller::ReleaseEditor::Edit
line 258 MusicBrainz::Server

Request data:

$VAR1 = {
'query_parameters' => {},
'body_parameters' => {
'artist_credit.names.0.name' => "\x

{41d}\x{438}\x{43a}\x{43e}\x{43b}a\x{439} \x{413}\x{438}\x{440}\x{448}\x{435}\x{432}\x{438}\x{447} \x{41a}a\x{43f}\x{443}\x{441}\x{442}\x{438}\x{43d}",
'packaging_id' => '',
'next' => "Next \x{bb}",
'date.month' => '6',
'release_group_id' => '1085799',
'labels.0.catalog_number' => 'NARD-5014',
'release_group.name' => "Kapustin Returns! (\x{41d}

\x

{438}\x{43a}\x{43e}\x{43b}a\x{439} \x{413}\x{438}

\x

{440}\x{448}\x{435}\x{432}\x{438}\x{447} \x{41a}a\x{43f}\x{443}\x{441}\x{442}\x{438}\x{43d})",
'artist_credit.names.0.artist.id' => '525479',
'labels.0.deleted' => '0',
'country_id' => '107',
'labels.0.name' => "\x{65e5}\x{672c}\x{30a2}\x{30b3}\x{30fc}\x{30b9}\x{30c6}\x{30a3}\x{30c3}\x{30af}\x{30ec}\x{30b3}\x{30fc}\x{30ba}",
'date.year' => '2008',
'script_id' => '28',
'status_id' => '1',
'date.day' => '5',
'name' => "Kapustin Returns! (\x{41d}\x{438}\x{43a}\x{43e}\x{43b}a\x{439} \x{413}\x{438}\x{440}

\x

{448}\x{435}\x{432}\x{438}\x{447} \x{41a}a\x{43f}\x{443}\x{441}\x{442}\x{438}\x{43d})",
'barcode' => '',
'artist_credit.names.0.join_phrase' => '',
'labels.0.label_id' => '51226',
'wizard_session_id' => '0.0114994615997013',
'language_id' => '120',
'comment' => '',
'gc-mode' => 'English',
'artist_credit.names.0.artist.name' => "\x{41d}\x{438}\x{43a}\x{43e}\x{43b}a\x{439} \x{413}\x{438}\x{440}\x{448}

\x

{435}

\x

{432}

\x

{438}\x{447} \x{41a}a\x{43f}\x{443}\x{441}\x{442}\x{438}

\x

{43d}

",
'annotation' => ''
}
};

URL: http://musicbrainz.org/release/fa0b9cc4-94ea-4b18-8a0c-238c45dae46c/edit