Cannot create issue

[nhatthm]

Hi, I've got this error while creating an issue that has checklist. Please help to fix it

Started POST "/projects/[CENSORED]/issues" for 116.100.134.20 at 2015-06-09 01:12:57 +0700
Processing by IssuesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"[CENSORED]", "issue"=>{"is_private"=>"0", "tracker_id"=>"2", "subject"=>"Setup project structure", "description"=>"Setup project structure", "status_id"=>"1", "priority_id"=>"6", "assigned_to_id"=>"3", "category_id"=>"36", "fixed_version_id"=>"", "parent_issue_id"=>"", "start_date"=>"2015-06-09", "due_date"=>"2015-06-11", "estimated_hours"=>"", "done_ratio"=>"0", "custom_field_values"=>{"11"=>"", "12"=>""}}, "was_default_status"=>"1", "check_list_items"=>[{"subject"=>"Git Repository"}, {"subject"=>"Setup drupal project"}, {"subject"=>"Setup local server"}, {"subject"=>"Install contrib modules"}, {"subject"=>"Setup Elasticsearch server"}, {"subject"=>"Configure basic information"}], "new_checklist"=>"", "commit"=>"Create", "project_id"=>"[CENSORED]"}
  Current user: [CENSORED] (id=3)
WARNING: Can't mass-assign protected attributes for IssueChecklist: is_done, subject

WARNING: Can't mass-assign protected attributes for IssueChecklist: is_done, subject

WARNING: Can't mass-assign protected attributes for IssueChecklist: is_done, subject

WARNING: Can't mass-assign protected attributes for IssueChecklist: is_done, subject

WARNING: Can't mass-assign protected attributes for IssueChecklist: is_done, subject

WARNING: Can't mass-assign protected attributes for IssueChecklist: is_done, subject

Completed 500 Internal Server Error in 164ms (ActiveRecord: 6.2ms)

NoMethodError (undefined method `strip' for nil:NilClass):
  plugins/redmine_issue_checklist/app/models/issue_checklist.rb:21:in `info'
  activerecord (4.2.1) lib/active_record/relation/delegation.rb:46:in `collect'
  activerecord (4.2.1) lib/active_record/relation/delegation.rb:46:in `collect'
  plugins/redmine_issue_checklist/lib/redmine_issue_checklist/patches/issue_patch.rb:39:in `update_checklist_items'
  plugins/redmine_issue_checklist/lib/redmine_issue_checklist/patches/issues_controller_patch.rb:13:in `build_new_issue_from_params_with_checklist'
  activesupport (4.2.1) lib/active_support/callbacks.rb:432:in `block in make_lambda'
  activesupport (4.2.1) lib/active_support/callbacks.rb:145:in `call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:145:in `block in halting_and_conditional'
  activesupport (4.2.1) lib/active_support/callbacks.rb:504:in `call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:504:in `block in call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:504:in `each'
  activesupport (4.2.1) lib/active_support/callbacks.rb:504:in `call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:92:in `_run_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:776:in `_run_process_action_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (4.2.1) lib/abstract_controller/callbacks.rb:19:in `process_action'
  actionpack (4.2.1) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.2.1) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
  activesupport (4.2.1) lib/active_support/notifications.rb:164:in `block in instrument'
  activesupport (4.2.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.2.1) lib/active_support/notifications.rb:164:in `instrument'
  actionpack (4.2.1) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.2.1) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
  activerecord (4.2.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.2.1) lib/abstract_controller/base.rb:137:in `process'
  actionview (4.2.1) lib/action_view/rendering.rb:30:in `process'
  actionpack (4.2.1) lib/action_controller/metal.rb:196:in `dispatch'
  actionpack (4.2.1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.2.1) lib/action_controller/metal.rb:237:in `block in action'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:74:in `call'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:74:in `dispatch'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:43:in `serve'
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:43:in `block in serve'
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in `each'
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in `serve'
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:819:in `call'
  rack-raw-upload (1.1.1) lib/rack/raw_upload.rb:18:in `call'
  rack-openid (1.4.2) lib/rack/openid.rb:98:in `call'
  request_store (1.0.5) lib/request_store/middleware.rb:9:in `call'
  rack (1.6.0) lib/rack/etag.rb:24:in `call'
  rack (1.6.0) lib/rack/conditionalget.rb:38:in `call'
  rack (1.6.0) lib/rack/head.rb:13:in `call'
  actionpack-xml_parser (1.0.2) lib/action_dispatch/xml_params_parser.rb:16:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/flash.rb:260:in `call'
  rack (1.6.0) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.6.0) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/cookies.rb:560:in `call'
  activerecord (4.2.1) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:649:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `call'
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `_run_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:776:in `_run_call_callbacks'
  activesupport (4.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.2.1) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.6.0) lib/rack/methodoverride.rb:22:in `call'
  rack (1.6.0) lib/rack/runtime.rb:18:in `call'
  activesupport (4.2.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  actionpack (4.2.1) lib/action_dispatch/middleware/static.rb:113:in `call'
  rack (1.6.0) lib/rack/sendfile.rb:113:in `call'
  railties (4.2.1) lib/rails/engine.rb:518:in `call'
  railties (4.2.1) lib/rails/application.rb:164:in `call'
  rack (1.6.0) lib/rack/lock.rb:17:in `call'
  rack (1.6.0) lib/rack/content_length.rb:15:in `call'
  rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service'
  /usr/share/ruby/webrick/httpserver.rb:138:in `service'
  /usr/share/ruby/webrick/httpserver.rb:94:in `run'
  /usr/share/ruby/webrick/server.rb:295:in `block in start_thread'

[nhatthm]

Same as #5

[bes1002t]

No it's not the same like #5 . It's the same like #7

Getting the exception while closing or creating an ticket is a different behavior, but maybe it's the same problem