Redmine

I'm troubled with redmine.

When I create new issue with Rest API, Internal Error 500 happened. Seeing from production.log, "NoMethodError" is happened (see below message)

Started POST "/redmine/issues.xml?key=XXXXXXX" for XX.XX.XX.XXX at 2016-05-30 14:44:10 +0900
Processing by IssuesController#create as XML Parameters: {"issue"=>`
{"project_id"=>"mt001", "subject"=>"TEST_AI", "tracker_id"=>"6",
"category_id"=>"136", "assigned_to_id"=>"4", "fixed_version_id"=>"93",
"priority_id"=>"2", "parent_issue_id"=>nil, 
"start_date"=>"2016-05-30", "due_date"=>"2016-06-01", 
"description"=>"Redmine TEST AI", "status_id"=>"1"},
"key"=>"XXXXXXX(hidden for security"}
Current user: user1 (id=65)
Completed 500 Internal Server Error in 367ms (ActiveRecord: 19.9ms)
NoMethodError (undefined method `shared_versions' for nil:NilClass):
  app/models/issue.rb:823:in `assignable_versions'
  app/models/issue.rb:643:in `validate_issue'
  app/controllers/issues_controller.rb:141:in `create'
  lib/redmine/sudo_mode.rb:63:in `sudo_mode'

So, I tried to create new issew using web browser (IE11). The ticket was created normally. Here is production.log.

Started POST "/redmine/projects/mt001/issues" for XX.XX.XX.XXX at 2016-05-30 14:58:23 +0900
Processing by IssuesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"QF1BA5MgwysJsAiFfT/h95DeZ/VgzSGOnryR6xUn4mmWpf7EZ8XFJqpaye/ZLXrKR/wV00dKOz8KbhP94VcUyg==", "form_update_triggered_by"=>"",     "issue"=>{"tracker_id"=>"6", "subject"=>"Test2", "description"=>"This is test", "status_id"=>"1", "priority_id"=>"2", "assigned_to_id"=>"4", "category_id"=>"132", "fixed_version_id"=>"127", "parent_issue_id"=>"", "start_date"=>"2016-05-30", "due_date"=>"2016-06-03", "custom_field_values"=>{"12"=>"", "41"=>""}}, "was_default_status"=>"1", "commit"=>"create", "project_id"=>"mt001"}
  Current user: user1 (id=65)
  Rendered mailer/_issue.text.erb (7.1ms)
  Rendered mailer/issue_add.text.erb within layouts/mailer (9.8ms)
  Rendered mailer/_issue.html.erb (3.0ms)
  Rendered mailer/issue_add.html.erb within layouts/mailer (5.1ms)
Redirected to http://mydepartment.co.jp/redmine/issues/1717
Completed 302 Found in 3697ms (ActiveRecord: 130.3ms)

So I add "Nil Judgement" like this.

def assignable_versions
  return @assignable_versions if @assignable_versions

  # Add Nil Judgement
  versions = project.shared_versions.open.to_a *unless project.nil?*

  ...
  #Add Nil Judgement
  @assignable_versions = versions.uniq.sort *unless versions.nil?*
end

"assignable_version" is called in "validate_issue".
After this modification, the another error is occured in "validate_issue".
Here is error sentense.

if !assignable_versions.include?(fixed_version)

Of cource, "assignable_versions" must be nil, error happen surely.

I already tried to migrate, clear cache. What should I do next.

Here is my environment on RHEL7.2

Environment:
  Redmine version                3.2.0.stable
  Ruby version                   2.2.4-p230 (2015-12-16) [x86_64-linux]
  Rails version                  4.2.5
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.7.14
  Git                            1.8.3.1
  Filesystem                     
Redmine plugins:
  redmine_export_with_journals   0.0.8
  redmine_importer               1.2.2
  redmine_local_avatars          1.0.0
  redmine_xlsx_format_issue_exporter 0.1.2
  sidebar_hide                   0.0.7