diff --git a/app/views/issues/_select_projects.html.erb b/app/views/issues/_select_projects.html.erb
index c6bd154..ff7c074 100644
--- a/app/views/issues/_select_projects.html.erb
+++ b/app/views/issues/_select_projects.html.erb
@@ -4,11 +4,17 @@
     <!-- this condition to avoid calling  @issue.allowed_target_projects ,in the pages (show/edit "open link in new tab" /new),
       call this method only for edit by "render_form_by_ajax" -->
     <% allowed_projects = @allowed_target_projects.present? ? @allowed_target_projects : @issue.allowed_target_projects %>
-    <% select_options = project_tree_options_for_select((allowed_projects | @issue.projects) - [@issue.project], :selected => [@issue.project] | @issue.projects) %>
 
+    <!--  In case of fail validation @issue.projects are assignable_projects , and assignable_projects is not nill, see issue_patch file (assignable_projects #List related projects before save) -->
+    <% if @issue.assignable_projects.nil? %>
+      <% select_options = project_tree_options_for_select((allowed_projects | @issue.projects) - [@issue.project], :selected => [@issue.project] | @issue.projects) %>
+      <%= render 'projects_list', issue: @issue, selected_projects: @issue.projects, allowed_target_projects: allowed_projects %>
+    <% else %>
+      <% select_options = project_tree_options_for_select((allowed_projects | @issue.assignable_projects) - [@issue.project], :selected => [@issue.project] | @issue.assignable_projects) %>
+      <%= render 'projects_list', issue: @issue, selected_projects: @issue.assignable_projects, allowed_target_projects: allowed_projects %>
+    <% end %>
     <%= f.select :project_ids, select_options, {:label => l("related_projects")},
                  {:multiple => true, style: "display:none;"} %>
-    <%= render 'projects_list', issue: @issue, selected_projects: @issue.projects, allowed_target_projects: allowed_projects %>
     <a href="#" class="load-modal-projects-selection" id="loadModalProjectsSelection"><%= l('modify_projects')%></a>
     <label id=answers-on-secondary-projects class="inline answers-on-secondary-projects" style="<%= "display:none;" if @issue.projects.none? %>"><%= f.check_box :answers_on_secondary_projects, :no_label => true %><%= l(:field_answers_on_secondary_projects) %></label>
   </p>
diff --git a/lib/redmine_multiprojects_issue/issues_controller_patch.rb b/lib/redmine_multiprojects_issue/issues_controller_patch.rb
index d30b9ee..bbcec97 100644
--- a/lib/redmine_multiprojects_issue/issues_controller_patch.rb
+++ b/lib/redmine_multiprojects_issue/issues_controller_patch.rb
@@ -20,7 +20,8 @@ def load_projects_selection
     issue_project_attribute = [@issue.project.id, @issue.project.name, @issue.project.status, @issue.project.lft, @issue.project.rgt]
     @issue_projects_attributes_array = issue_projects_attributes_array | [issue_project_attribute]
 
-    vals = Rails.env.test? ? JSON.parse(params[:allowed_projects]) : params[:allowed_projects].permit!.to_h.values
+    # This condition(Rails.env.test? && params[:format] == 'js') for the IssuesController test, by post method
+    vals = Rails.env.test? && params[:format] == 'js' ? JSON.parse(params[:allowed_projects]) : params[:allowed_projects].permit!.to_h.values
     # convert to int 
     allowed_target_projects_attributes_array = vals.map do |id, name, status, lft, rgt|
       [id.to_i, name, status.to_i, lft.to_i, rgt.to_i]
diff --git a/spec/system/issue_system_spec.rb b/spec/system/issue_system_spec.rb
new file mode 100644
index 0000000..5cef074
--- /dev/null
+++ b/spec/system/issue_system_spec.rb
@@ -0,0 +1,65 @@
+require "spec_helper"
+require "active_support/testing/assertions" 
+
+RSpec.describe "/issue/id/edit", type: :system do
+  include ActiveSupport::Testing::Assertions
+
+  fixtures :projects, :users, :issues, :workflows, :members, :member_roles, :roles
+
+  def log_user(login, password)
+    visit '/my/page'
+    expect(current_path).to eq '/login'
+
+    if Redmine::Plugin.installed?(:redmine_scn)
+      click_on("ou s'authentifier par login / mot de passe")
+    end
+
+    within('#login-form form') do
+      fill_in 'username', with: login
+      fill_in 'password', with: password
+      find('input[name=login]').click
+    end
+    expect(current_path).to eq '/my/page'
+  end
+
+  before do
+    log_user('admin', 'admin')
+  end
+
+  describe "Fail validation of issue" do
+    let!(:issue) { Issue.first }
+
+    it "Should keep the selected projects" do
+      # Related projects 0
+      expect(issue.projects.count).to eq(0)
+
+      visit edit_issue_path( id: issue.id)
+      # open  Related projects modal
+      find('#loadModalProjectsSelection').click
+
+      within '#ajax-modal' do
+        # select projects with id  3 , 5
+        find("input[value='5']").click
+        find("input[value='3']").click
+
+        find("input[id='button_apply_projects']").click
+      end
+      
+      # Make fail validation
+      fill_in 'issue_subject', with: ''
+      
+      find("input[name='commit']").click
+      
+      expect(page).to have_selector("span", text: "#{Project.find(3).name}")
+      expect(page).to have_selector("span", text: "#{Project.find(5).name}")
+
+      # Remake succes validation
+      fill_in 'issue_subject', with: 'test'
+      find("input[name='commit']").click
+
+      # Related projects 2
+      expect(issue.projects.count).to eq(2)
+    end
+    
+  end
+end