Internal Server Error

Oops, something went wrong!

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 317 MusicBrainz::Server::Wizard
line 272 MusicBrainz::Server::Wizard
line 131 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

{5510}\x{671d}",
'packaging_id' => '1',
'next' => "Next \x{bb}",
'date.month' => '',
'release_group_id' => '1087016',
'labels.0.catalog_number' => '',
'release_group.name' => 'A Dream Return to Tang Dynasty',
'artist_credit.names.0.artist.id' => '390449',
'labels.0.deleted' => '0',
'country_id' => '44',
'labels.0.name' => 'Universal Music Group',
'date.year' => '1992',
'script_id' => '28',
'status_id' => '1',
'date.day' => '',
'name' => 'A Dream Return to Tang Dynasty',
'barcode' => '9787798700756',
'artist_credit.names.0.join_phrase' => '',
'labels.0.label_id' => '151',
'wizard_session_id' => '0.464372071340712',
'language_id' => '120',
'comment' => '',
'gc-mode' => 'English',
'artist_credit.names.0.artist.name' => "\x{5510}

\x

{671d}

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

URL: http://musicbrainz.org/release/138fff0b-86c6-449f-baee-7a79df3d173d/edit