When attempting to add 'Hello My Friends Do You Read Me?' to Tam! (both from freedb import as well as manually from a cd lookup) the following server error presents, and prevents final submission:
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(0x106b7058)', 'Try::Tiny::Catch=REF(0x106b7310)') called at lib/Sql.pm line 430
Sql::_select_list('Sql=HASH(0xca3d320)', 'INSERT INTO release (date_day,country,script,language,release...', 'ARRAY(0x106ae288)', 'arrayref', 'CODE(0x4c203c8)') called at lib/Sql.pm line 449
Sql::select_list_of_lists('Sql=HASH(0xca3d320)', 'INSERT INTO release (date_day,country,script,language,release...', undef, 222, 28, 120, 1203100, 1, 933812, ...) called at lib/Sql.pm line 382
Sql::select_single_column_array('Sql=HASH(0xca3d320)', 'INSERT INTO release (date_day,country,script,language,release...', undef, 222, 28, 120, 1203100, 1, 933812, ...) called at lib/Sql.pm line 397
Sql::select_single_value('Sql=HASH(0xca3d320)', 'INSERT INTO release (date_day,country,script,language,release...', undef, 222, 28, 120, 1203100, 1, 933812, ...) called at lib/Sql.pm line 150
Sql::insert_row('Sql=HASH(0xca3d320)', 'release', 'HASH(0x10685ff0)', 'id') called at lib/MusicBrainz/Server/Data/Release.pm line 540
MusicBrainz::Server::Data::Release::insert('MusicBrainz::Server::Data::Release=HASH(0xb3c4c60)', 'HASH(0xdfa0f50)') called at lib/MusicBrainz/Server/Edit/Generic/Create.pm line 45
MusicBrainz::Server::Edit::Generic::Create::insert('MusicBrainz::Server::Edit::Release::Create=HASH(0x1069d8b8)') called at lib/MusicBrainz/Server/Data/Edit.pm line 391
MusicBrainz::Server::Data::Edit::create('MusicBrainz::Server::Data::Edit=HASH(0xab77638)', 'edit_type', 31, 'editor_id', 93418, 'packaging_id', 1, 'privileges', 0, ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1266
MusicBrainz::Server::Wizard::ReleaseEditor::_ANON_('edit_type', 31, 'editor_id', 93418, 'packaging_id', 1, 'privileges', 0, 'date', ...) 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(0x1069cfa0)', 'Try::Tiny::Catch=REF(0x106adf10)') called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1302
MusicBrainz::Server::Wizard::ReleaseEditor::_create_edit('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd5d8790)', 'CODE(0xdf9fe58)', 31, 93418, 'privileges', 0, 'packaging_id', 1, 'date', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 1267
MusicBrainz::Server::Wizard::ReleaseEditor::_submit_edit('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd5d8790)', 31, 'in hand.', 'packaging_id', 1, 'date', 'HASH(0xdf9f540)', 'name', 'Hello My Friends Do You Read Me?', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 848
MusicBrainz::Server::Wizard::ReleaseEditor::_ANON_(31, 'in hand.', 'packaging_id', 1, 'date', 'HASH(0xdf9f540)', 'name', 'Hello My Friends Do You Read Me?', 'barcode', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor/Add.pm line 219
MusicBrainz::Server::Wizard::ReleaseEditor::Add::_ANON_('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd5d8790)', 'data', 'HASH(0xdf9f510)', 'create_edit', 'CODE(0xdef08a8)', 'edit_note', 'in hand.', '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(0xd5d8790)', 'data', 'HASH(0xdf9f510)', 'create_edit', 'CODE(0xdef08a8)', 'edit_note', 'in hand.', '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(0xd5d8790)', 'data', 'HASH(0xdf9f510)', 'create_edit', 'CODE(0xdef08a8)', 'edit_note', 'in hand.', '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(0xd5d8790)', 'data', 'HASH(0xdf9f510)', 'create_edit', 'CODE(0xdef08a8)', 'edit_note', 'in hand.', '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(0xd5d8790)', 'data', 'HASH(0xdf9f510)', 'create_edit', 'CODE(0xdef08a8)', 'edit_note', 'in hand.', 'previewing', '', ...) called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 849
MusicBrainz::Server::Wizard::ReleaseEditor::prepare_edits('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd5d8790)') called at lib/MusicBrainz/Server/Wizard/ReleaseEditor.pm line 94
MusicBrainz::Server::Wizard::ReleaseEditor::run('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xd5d8790)') called at lib/MusicBrainz/Server/Controller/ReleaseEditor/Add.pm line 23
MusicBrainz::Server::Controller::ReleaseEditor::Add::add('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xbc...', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xbfeecd0)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xbc...', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst.pm line 1667
eval {...}

called at local/lib/perl5/Catalyst.pm line 1667
Catalyst::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbfeecd0)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbfeecd0)') called at lib/MusicBrainz/Server.pm line 322
MusicBrainz::Server::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbfeecd0)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xbfeecd0)', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst/Controller.pm line 125
Catalyst::Controller::_ACTION('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xbc...', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xbe9d910)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xbc...', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst.pm line 1667
eval

{...} called at local/lib/perl5/Catalyst.pm line 1667
Catalyst::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbe9d910)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbe9d910)') called at lib/MusicBrainz/Server.pm line 322
MusicBrainz::Server::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbe9d910)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xbe9d910)', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 257
Catalyst::Dispatcher::_do_forward('Catalyst::Dispatcher=HASH(0x3803ec0)', 'forward', 'MusicBrainz::Server=HASH(0xd5bf3f8)', '_ACTION') called at local/lib/perl5/Catalyst/Dispatcher.pm line 237
Catalyst::Dispatcher::forward('Catalyst::Dispatcher=HASH(0x3803ec0)', 'MusicBrainz::Server=HASH(0xd5bf3f8)', '_ACTION') called at local/lib/perl5/Catalyst.pm line 342
Catalyst::forward('MusicBrainz::Server=HASH(0xd5bf3f8)', '_ACTION') called at local/lib/perl5/Catalyst/Controller.pm line 99
Catalyst::Controller::_DISPATCH('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xbc...', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xbfeee38)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xbc...', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst.pm line 1667
eval {...}

called at local/lib/perl5/Catalyst.pm line 1667
Catalyst::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbfeee38)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbfeee38)') called at lib/MusicBrainz/Server.pm line 322
MusicBrainz::Server::execute('MusicBrainz::Server=HASH(0xd5bf3f8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbfeee38)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xbfeee38)', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 257
Catalyst::Dispatcher::_do_forward('Catalyst::Dispatcher=HASH(0x3803ec0)', 'forward', 'MusicBrainz::Server=HASH(0xd5bf3f8)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst/Dispatcher.pm line 237
Catalyst::Dispatcher::forward('Catalyst::Dispatcher=HASH(0x3803ec0)', 'MusicBrainz::Server=HASH(0xd5bf3f8)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst.pm line 342
Catalyst::forward('MusicBrainz::Server=HASH(0xd5bf3f8)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst/Dispatcher.pm line 105
Catalyst::Dispatcher::dispatch('Catalyst::Dispatcher=HASH(0x3803ec0)', 'MusicBrainz::Server=HASH(0xd5bf3f8)') called at local/lib/perl5/Catalyst.pm line 1613
Catalyst::dispatch('MusicBrainz::Server=HASH(0xd5bf3f8)') called at lib/MusicBrainz/Server.pm line 286
Class::MOP::Class:::around('CODE(0x2c43aa8)', 'MusicBrainz::Server=HASH(0xd5bf3f8)') 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(0xd5bf3f8)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 91
MusicBrainz::Server::dispatch('MusicBrainz::Server=HASH(0xd5bf3f8)') 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(0xd458db8)', 'Try::Tiny::Catch=REF(0xd5a0dc0)') called at local/lib/perl5/Catalyst.pm line 1969
Catalyst::handle_request('MusicBrainz::Server', 'env', 'HASH(0xce23f50)') called at lib/Catalyst/Plugin/AutoRestart.pm line 119
Catalyst::Plugin::AutoRestart::handle_request('MusicBrainz::Server', 'env', 'HASH(0xce23f50)') called at local/lib/perl5/Catalyst/Engine.pm line 856
Catalyst::Engine::_ANON_('CODE(0xc299f80)') called at local/lib/perl5/Plack/Handler/FCGI.pm line 134
Plack::Handler::FCGI::run('Plack::Handler::FCGI=HASH(0x10e2a30)', 'CODE(0xc1fe8a8)') called at local/lib/perl5/Plack/Loader.pm line 88
Plack::Loader::run('Plack::Loader=HASH(0x10abe00)', 'Plack::Handler::FCGI=HASH(0x10e2a30)') called at local/lib/perl5/Plack/Runner.pm line 263
Plack::Runner::run('Plack::Runner=HASH(0xeae808)') 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' => {},
'body_parameters' =>

{ 'save' => 'Enter edit', 'wizard_page_id' => '5', 'edit_note' => 'in hand.', 'id' => '', 'wizard_session_id' => '37193' }

};

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