diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index 1e80a713..75affee3 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -197,17 +197,26 @@ class ProjectsController < ApplicationController
   # Add a new issue category to @project
   def add_issue_category
     @category = @project.issue_categories.build(params[:category])
-    if request.post? and @category.save
-  	  respond_to do |format|
-        format.html do
-          flash[:notice] = l(:notice_successful_create)
-          redirect_to :action => 'settings', :tab => 'categories', :id => @project
+    if request.post?
+      if @category.save
+    	  respond_to do |format|
+          format.html do
+            flash[:notice] = l(:notice_successful_create)
+            redirect_to :action => 'settings', :tab => 'categories', :id => @project
+          end
+          format.js do
+            # IE doesn't support the replace_html rjs method for select box options
+            render(:update) {|page| page.replace "issue_category_id",
+              content_tag('select', '<option></option>' + options_from_collection_for_select(@project.issue_categories, 'id', 'name', @category.id), :id => 'issue_category_id', :name => 'issue[category_id]')
+            }
+          end
         end
-        format.js do
-          # IE doesn't support the replace_html rjs method for select box options
-          render(:update) {|page| page.replace "issue_category_id",
-            content_tag('select', '<option></option>' + options_from_collection_for_select(@project.issue_categories, 'id', 'name', @category.id), :id => 'issue_category_id', :name => 'issue[category_id]')
-          }
+      else
+        respond_to do |format|
+          format.html
+          format.js do
+            render(:update) {|page| page.alert(@category.errors.full_messages.join('\n')) }
+          end
         end
       end
     end