I tried to add this album: http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG

Then I got this error:

Caught exception in MusicBrainz::Server::Controller::ReleaseEditor::Add->add "DBD::Pg::st execute failed: ERROR: null value in column "comment" violates not-null constraint at lib/Sql.pm line 414.
at lib/Sql.pm line 429
Sql::_ANON_('DBD::Pg::st execute failed: ERROR: null value in column "com...') called at local/lib/perl5/Try/Tiny.pm line 100
Try::Tiny::try('CODE(0x1084cbc0)', 'Try::Tiny::Catch=REF(0x1083a990)') called at lib/Sql.pm line 430
Sql::_select_list('Sql=HASH(0xd1f0cc8)', 'INSERT INTO release (date_day,script,language,release_group,s...', 'ARRAY(0x107d6ea0)', 'arrayref', 'CODE(0x4fa44e0)') called at lib/Sql.pm line 449
Sql::select_list_of_lists('Sql=HASH(0xd1f0cc8)', 'INSERT INTO release (date_day,script,language,release_group,s...', undef, 28, 120, 1203127, 1, 933837, 1066094, ...) called at lib/Sql.pm line 382
Sql::select_single_column_array('Sql=HASH(0xd1f0cc8)', 'INSERT INTO release (date_day,script,language,release_group,s...', undef, 28, 120, 1203127, 1, 933837, 1066094, ...) called at lib/Sql.pm line 397
Sql::select_single_value('Sql=HASH(0xd1f0cc8)', 'INSERT INTO release (date_day,script,language,release_group,s...', undef, 28, 120, 1203127, 1, 933837, 1066094, ...) called at lib/Sql.pm line 150
Sql::insert_row('Sql=HASH(0xd1f0cc8)', 'release', 'HASH(0x10822280)', 'id') called at lib/MusicBrainz/Server/Data/Release.pm line 540
MusicBrainz::Server::Data::Release::insert('MusicBrainz::Server::Data::Release=HASH(0xb747740)', 'HASH(0x1084c020)') called at lib/MusicBrainz/Server/Edit/Generic/Create.pm line 45
MusicBrainz::Server::Edit::Generic::Create::insert('MusicBrainz::Server::Edit::Release::Create=HASH(0x1083ad48)') called at lib/MusicBrainz/Server/Data/Edit.pm line 391
MusicBrainz::Server::Data::Edit::create('MusicBrainz::Server::Data::Edit=HASH(0xaefa2e0)', 'edit_type', 31, 'editor_id', 560985, 'privileges', 0, 'date', 'HASH(0xe184ef8)', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1266
MusicBrainz::Server::Wizard::ReleaseEditor::_ANON_('edit_type', 31, 'editor_id', 560985, 'privileges', 0, 'date', 'HASH(0xe184ef8)', 'name', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1293
MusicBrainz::Server::Wizard::ReleaseEditor::_ANON_() called at local/lib/perl5/Try/Tiny.pm line 76
eval

{...} called at local/lib/perl5/Try/Tiny.pm line 67
Try::Tiny::try('CODE(0x1083b848)', 'Try::Tiny::Catch=REF(0x1084ed20)') called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1302
MusicBrainz::Server::Wizard::ReleaseEditor::_create_edit('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)', 'CODE(0xe185e40)', 31, 560985, 'privileges', 0, 'date', 'HASH(0xe184ef8)', 'name', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1267
MusicBrainz::Server::Wizard::ReleaseEditor::_submit_edit('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)', 31, 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and ...', 'date', 'HASH(0xe184ef8)', 'name', 'Dirty Blonde Trio EP', 'barcode', undef, ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 848
MusicBrainz::Server::Wizard::ReleaseEditor::_ANON_(31, 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and ...', 'date', 'HASH(0xe184ef8)', 'name', 'Dirty Blonde Trio EP', 'barcode', undef, 'artist_credit', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor/Add.pm line 219
MusicBrainz::Server::Wizard::ReleaseEditor::Add::_ANON_('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)', 'data', 'HASH(0xe184e20)', 'create_edit', 'CODE(0xe0d6e88)', 'edit_note', 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and ...', 'previewing', '', ...) called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Moose.pm line 119
Moose::inner() called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 922
MusicBrainz::Server::Wizard::ReleaseEditor::create_edits('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)', 'data', 'HASH(0xe184e20)', 'create_edit', 'CODE(0xe0d6e88)', 'edit_note', 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and ...', 'previewing', '', ...) called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Moose/Meta/Method/Augmented.pm line 48
MusicBrainz::Server::Wizard::ReleaseEditor::Add::create_edits('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)', 'data', 'HASH(0xe184e20)', 'create_edit', 'CODE(0xe0d6e88)', 'edit_note', 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and ...', 'previewing', '', ...) called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 56
Class::MOP::Method::Wrapped::_ANON_('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)', 'data', 'HASH(0xe184e20)', 'create_edit', 'CODE(0xe0d6e88)', 'edit_note', 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and ...', 'previewing', '', ...) called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 91
MusicBrainz::Server::Wizard::ReleaseEditor::Add::create_edits('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)', 'data', 'HASH(0xe184e20)', 'create_edit', 'CODE(0xe0d6e88)', 'edit_note', 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and ...', 'previewing', '', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 849
MusicBrainz::Server::Wizard::ReleaseEditor::prepare_edits('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)') called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 94
MusicBrainz::Server::Wizard::ReleaseEditor::run('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd141e50)') called at lib/MusicBrainz/Server/Controller/ReleaseEditor/Add.pm line 23
MusicBrainz::Server::Controller::ReleaseEditor::Add::add('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xc0...', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xc371e30)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xc0...', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst.pm line 1667
eval {...}

called at local/lib/perl5/Catalyst.pm line 1667
Catalyst::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc371e30)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc371e30)') called at lib/MusicBrainz/Server.pm line 322
MusicBrainz::Server::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc371e30)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xc371e30)', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst/Controller.pm line 125
Catalyst::Controller::_ACTION('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xc0...', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xc220e10)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xc0...', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst.pm line 1667
eval

{...} called at local/lib/perl5/Catalyst.pm line 1667
Catalyst::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc220e10)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc220e10)') called at lib/MusicBrainz/Server.pm line 322
MusicBrainz::Server::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc220e10)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xc220e10)', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 257
Catalyst::Dispatcher::_do_forward('Catalyst::Dispatcher=HASH(0x36c6308)', 'forward', 'MusicBrainz::Server=HASH(0xd10a8f0)', '_ACTION') called at local/lib/perl5/Catalyst/Dispatcher.pm line 237
Catalyst::Dispatcher::forward('Catalyst::Dispatcher=HASH(0x36c6308)', 'MusicBrainz::Server=HASH(0xd10a8f0)', '_ACTION') called at local/lib/perl5/Catalyst.pm line 342
Catalyst::forward('MusicBrainz::Server=HASH(0xd10a8f0)', '_ACTION') called at local/lib/perl5/Catalyst/Controller.pm line 99
Catalyst::Controller::_DISPATCH('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xc0...', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xc371f98)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xc0...', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst.pm line 1667
eval {...}

called at local/lib/perl5/Catalyst.pm line 1667
Catalyst::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc371f98)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc371f98)') called at lib/MusicBrainz/Server.pm line 322
MusicBrainz::Server::execute('MusicBrainz::Server=HASH(0xd10a8f0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xc371f98)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xc371f98)', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 257
Catalyst::Dispatcher::_do_forward('Catalyst::Dispatcher=HASH(0x36c6308)', 'forward', 'MusicBrainz::Server=HASH(0xd10a8f0)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst/Dispatcher.pm line 237
Catalyst::Dispatcher::forward('Catalyst::Dispatcher=HASH(0x36c6308)', 'MusicBrainz::Server=HASH(0xd10a8f0)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst.pm line 342
Catalyst::forward('MusicBrainz::Server=HASH(0xd10a8f0)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst/Dispatcher.pm line 105
Catalyst::Dispatcher::dispatch('Catalyst::Dispatcher=HASH(0x36c6308)', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst.pm line 1613
Catalyst::dispatch('MusicBrainz::Server=HASH(0xd10a8f0)') called at lib/MusicBrainz/Server.pm line 286
Class::MOP::Class:::around('CODE(0x2fc9098)', 'MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 162
Class::MOP::Method::Wrapped::_ANON_('MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 91
MusicBrainz::Server::dispatch('MusicBrainz::Server=HASH(0xd10a8f0)') called at local/lib/perl5/Catalyst.pm line 1963
Catalyst::_ANON_() called at local/lib/perl5/Try/Tiny.pm line 76
eval

{...}

called at local/lib/perl5/Try/Tiny.pm line 67
Try::Tiny::try('CODE(0xc61ad58)', 'Try::Tiny::Catch=REF(0xd71f058)') called at local/lib/perl5/Catalyst.pm line 1969
Catalyst::handle_request('MusicBrainz::Server', 'env', 'HASH(0xc9c3d00)') called at lib/Catalyst/Plugin/AutoRestart.pm line 119
Catalyst::Plugin::AutoRestart::handle_request('MusicBrainz::Server', 'env', 'HASH(0xc9c3d00)') called at local/lib/perl5/Catalyst/Engine.pm line 856
Catalyst::Engine::_ANON_('CODE(0xc9eb368)') called at local/lib/perl5/Plack/Handler/FCGI.pm line 134
Plack::Handler::FCGI::run('Plack::Handler::FCGI=HASH(0x1465a30)', 'CODE(0xc59ec50)') called at local/lib/perl5/Plack/Loader.pm line 88
Plack::Loader::run('Plack::Loader=HASH(0x142ee00)', 'Plack::Handler::FCGI=HASH(0x1465a30)') called at local/lib/perl5/Plack/Runner.pm line 263
Plack::Runner::run('Plack::Runner=HASH(0x1231808)') called at local/bin/plackup line 10"
Stack trace:
line 1301 MusicBrainz::Server::Wizard::ReleaseEditor
line 1302 MusicBrainz::Server::Wizard::ReleaseEditor
line 1267 MusicBrainz::Server::Wizard::ReleaseEditor
line 848 MusicBrainz::Server::Wizard::ReleaseEditor
line 219 MusicBrainz::Server::Wizard::ReleaseEditor::Add
line 922 MusicBrainz::Server::Wizard::ReleaseEditor
line 849 MusicBrainz::Server::Wizard::ReleaseEditor
line 94 MusicBrainz::Server::Wizard::ReleaseEditor
line 23 MusicBrainz::Server::Controller::ReleaseEditor::Add
line 322 MusicBrainz::Server
line 322 MusicBrainz::Server
line 322 MusicBrainz::Server
line 286 MusicBrainz::Server
Request data:

$VAR1 = {
'query_parameters' =>

{ 'artist' => '9beb4865-5bf7-48da-917e-143dd1741003' }

,
'body_parameters' =>

{ 'save' => 'Enter edit', 'wizard_page_id' => '5', 'edit_note' => 'http://www.amazon.com/Dirty-Blonde-Trio-EP/dp/B006ANKUKG and on spotify ', 'id' => '', 'wizard_session_id' => '37217' }

};