Redmine disallows users to delete a version targeted on an issue. However, verification is not done if the version is referenced throw a custom field. It results on a crash trying to show an issue that "uses" the deleted target.

• Bug seen in version 2.5.1.

• Patch applied on:

  commit 0cac2b85b325e00c861b2c9a0e94407ed0bb077b
  Author: Toshi MARUYAMA 
  Date:   Sun Jun 21 09:51:52 2015 +0000
  
  Merged r14360 from trunk to 2.6-stable (#20142)
  
  update Gemfile to require rbpdf ~>1.18.6.
  
  git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@14362 e93f8b46-1217-0410-a6f0-8f06a7374b81
  

• diff:
  

  
  
  diff --git a/app/controllers/versions_controller.rb b/app/controllers/versions_controller.rb
  
  index bc3852f..b8056ec 100644
  
  --- a/app/controllers/versions_controller.rb
  
  +++ b/app/controllers/versions_controller.rb
  
  @@ -146,7 +146,7 @@ class VersionsController < ApplicationController
  
  end
  

def destroy

• if @version.fixed_issues.empty?

• if @version.fixed_issues.empty? and !@version.referenced_by_a_custom_field?
  @version.destroy
  respond_to do |format|
  format.html { redirect_back_or_default settings_project_path(@project, :tab => 'versions') }
  diff --git a/app/models/version.rb b/app/models/version.rb
  index ed5b628..3df4caa 100644
  --- a/app/models/version.rb
  +++ b/app/models/version.rb
  @@ -168,6 +168,13 @@ class Version < ActiveRecord::Base
  @closed_issues_count
  end

• def referenced_by_a_custom_field?

• !CustomValue.where("custom_field_id IN (SELECT id

•                                        FROM #{CustomField.table_name}
  

•                                        WHERE field_format='version')
  

•                    AND value = ?", id).empty?
  

• end
  +
  def wiki_page
  if project.wiki && !wiki_page_title.blank?
  @wiki_page ||= project.wiki.find_page(wiki_page_title)