Fix bug.

app/controllers/admin/application_forms_controller.rb

@@ -1,6 +1,6 @@
 # encoding: utf-8
 class Admin::ApplicationFormsController < OrbitAdminController
-
+  Is_Rails5 = (Rails::VERSION::MAJOR >= 5)
   require 'axlsx'
   include Admin::ApplicationFormsHelper
   helper Admin::ApplicationFormsFieldHelper
@@ -603,7 +603,20 @@ class Admin::ApplicationFormsController < OrbitAdminController
         @application_form.update_user_id = current_user.id
         if @application_form.update_attributes(@application_form_params)
           @application_form.application_form_signup_fields.each{|t| t.destroy if t["to_delete"] == true}
-          redirect_to params['referer_url']  and return
+          if params['referer_url'].blank?
+            fallback_location = admin_application_forms_path
+            if Is_Rails5
+              redirect_back(fallback_location: fallback_location) and return
+            else
+              begin
+                redirect_to :back and return
+              rescue
+                redirect_to fallback_location and return
+              end
+            end
+          else
+            redirect_to params['referer_url']  and return
+          end
         else
           flash.now[:error] = t('update.error.category')
           render action: :edit  and return

app/views/admin/application_forms/_form.html.erb

@@ -377,7 +377,6 @@
 
 <!-- Form Actions -->
 <div class="form-actions">
-  <%= get_referer_url[:application_formion] rescue "" %>
   <%= f.submit t('submit'), class: 'btn btn-primary' %>
   <input type="hidden" name="referer_url" value="<%= get_referer_url %>">
   <%= link_to t('cancel'), admin_application_forms_path, :class=>"btn" %>  

app/views/admin/application_forms/application_form_signup_field.html.erb

@@ -26,6 +26,7 @@
       <button type="button" class="btn btn-success add-attributes"><%= t(:add_attribute_field) %></button>
       <%= hidden_field_tag 'id', params[:id] if !params[:id].blank? %>
       <%= f.submit t(:submit),:class=>"btn btn-primary"%>
+      <input type="hidden" name="referer_url" value="<%= get_referer_url %>">
       <%= link_to t('cancel'), get_go_back, :class=>"btn" %>              
     </div>
   </fieldset>

app/views/admin/application_forms/application_form_submission_field.html.erb

@@ -25,6 +25,7 @@
       <button type="button" class="btn btn-success add-attributes"><%= t(:add_attribute_field) %></button>
       <%= hidden_field_tag 'id', params[:id] if !params[:id].blank? %>
       <%= f.submit t(:submit),:class=>"btn btn-primary"%>
+      <input type="hidden" name="referer_url" value="<%= get_referer_url %>">
       <%= link_to t('cancel'), get_go_back, :class=>"btn" %>              
     </div>
   </fieldset>