error 500 on ssh key add

[jekel]

hello
when i'm trying to add any(valid or not) new public key on my settings page - redmine gives me 500 error
here is the error log:

Started POST "/my/public_keys" for ... at 2014-06-09 18:55:38 +0400
Processing by GitolitePublicKeysController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"...", "gitolite_public_key"=>{"title"=>"asdfasd", "key_type"=>"0", "delete_when_unused"=>"1", "key"=>"asdf"}, "cre
  Current user: 
Completed 500 Internal Server Error in 72.8ms


NoMethodError (undefined method `[]' for nil:NilClass):
  plugins/redmine_git_hosting/app/models/gitolite_public_key.rb:208:in `key_uniqueness'
  activesupport (3.2.17) lib/active_support/callbacks.rb:495:in `_run__2454677585896258442__validate__3626413234657450090__callbacks'
  activesupport (3.2.17) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.17) lib/active_support/callbacks.rb:385:in `_run_validate_callbacks'
  activesupport (3.2.17) lib/active_support/callbacks.rb:81:in `run_callbacks'
  activemodel (3.2.17) lib/active_model/validations.rb:228:in `run_validations!'
  activemodel (3.2.17) lib/active_model/validations/callbacks.rb:53:in `block in run_validations!'
  activesupport (3.2.17) lib/active_support/callbacks.rb:436:in `_run__2454677585896258442__validation__3626413234657450090__callbacks'
  activesupport (3.2.17) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.17) lib/active_support/callbacks.rb:385:in `_run_validation_callbacks'
  activesupport (3.2.17) lib/active_support/callbacks.rb:81:in `run_callbacks'
  activemodel (3.2.17) lib/active_model/validations/callbacks.rb:53:in `run_validations!'
  activemodel (3.2.17) lib/active_model/validations.rb:195:in `valid?'
  activerecord (3.2.17) lib/active_record/validations.rb:69:in `valid?'
  activerecord (3.2.17) lib/active_record/validations.rb:77:in `perform_validations'
  activerecord (3.2.17) lib/active_record/validations.rb:50:in `save'
  activerecord (3.2.17) lib/active_record/attribute_methods/dirty.rb:22:in `save'
  activerecord (3.2.17) lib/active_record/transactions.rb:259:in `block (2 levels) in save'
  activerecord (3.2.17) lib/active_record/transactions.rb:313:in `block in with_transaction_returning_status'
  activerecord (3.2.17) lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
  activerecord (3.2.17) lib/active_record/transactions.rb:208:in `transaction'
  activerecord (3.2.17) lib/active_record/transactions.rb:311:in `with_transaction_returning_status'
  activerecord (3.2.17) lib/active_record/transactions.rb:259:in `block in save'
  activerecord (3.2.17) lib/active_record/transactions.rb:270:in `rollback_active_record_state!'
  activerecord (3.2.17) lib/active_record/transactions.rb:258:in `save'
  plugins/redmine_git_hosting/app/controllers/gitolite_public_keys_controller.rb:20:in `create'

Environment:
  Redmine version                2.4.5.stable
  Ruby version                   1.9.3-p484 (2013-11-22) [x86_64-linux]
  Rails version                  3.2.17
  Environment                    production
  Database adapter               PostgreSQL
SCM:
  Subversion                     1.6.16
  Mercurial                      1.7
  Git                            1.8.5.5
  Filesystem                     
Redmine plugins:
  redmine_bootstrap_kit          0.1
  redmine_git_hosting            0.7.3
  redmine_plugin_views_revisions 0.0.1
  redmine_sidekiq                2.0.0

[n-rodriguez]

Thank you!