While trying to set some artist credits on an album <http://musicbrainz.org/release/ea8934d6-a81d-41a8-b025-b6be782ad258> I kept getting this error:

Internal Server Error
Oops, something went wrong!

Error:

Caught exception in MusicBrainz::Server::Controller::ReleaseEditor::Edit->edit "Can't call method "id" without a package or object reference at /home/musicbrainz/musicbrainz-server/script/../lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1208."
Stack trace:
line 1206 MusicBrainz::Server::Wizard::ReleaseEditor
line 787 MusicBrainz::Server::Wizard::ReleaseEditor
line 42 MusicBrainz::Server::Wizard::ReleaseEditor::Edit
line 859 MusicBrainz::Server::Wizard::ReleaseEditor
line 788 MusicBrainz::Server::Wizard::ReleaseEditor
line 94 MusicBrainz::Server::Wizard::ReleaseEditor
line 17 MusicBrainz::Server::Controller::ReleaseEditor::Edit
line 273 MusicBrainz::Server
Request data:

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

{ 'save' => 'Enter edit', 'wizard_page_id' => '4', 'edit_note' => 'Localized artists.', 'wizard_session_id' => '0.548779399224685' }

};

URL: http://musicbrainz.org/release/ea8934d6-a81d-41a8-b025-b6be782ad258/edit