diff --git a/core/lib/Thelia/Model/Tools/UrlRewritingTrait.php b/core/lib/Thelia/Model/Tools/UrlRewritingTrait.php
index 444e4dfa3..d4b18ea24 100644
--- a/core/lib/Thelia/Model/Tools/UrlRewritingTrait.php
+++ b/core/lib/Thelia/Model/Tools/UrlRewritingTrait.php
@@ -61,7 +61,11 @@ trait UrlRewritingTrait {
 
         $this->setLocale($locale);
 
-        $title = $this->getTitle() ?: $this->getRef();
+        $title = $this->getTitle();
+
+        if(null == $title) {
+            throw new \RuntimeException('Impossible to create an url if title is null');
+        }
         // Replace all weird characters with dashes
         $string = preg_replace('/[^\w\-~_\.]+/u', '-', $title);
 
diff --git a/core/lib/Thelia/Tests/Rewriting/CategoryRewritingTest.php b/core/lib/Thelia/Tests/Rewriting/CategoryRewritingTest.php
new file mode 100644
index 000000000..4291d56de
--- /dev/null
+++ b/core/lib/Thelia/Tests/Rewriting/CategoryRewritingTest.php
@@ -0,0 +1,104 @@
+<?php
+/*************************************************************************************/
+/*                                                                                   */
+/*      Thelia	                                                                     */
+/*                                                                                   */
+/*      Copyright (c) OpenStudio                                                     */
+/*      email : info@thelia.net                                                      */
+/*      web : http://www.thelia.net                                                  */
+/*                                                                                   */
+/*      This program is free software; you can redistribute it and/or modify         */
+/*      it under the terms of the GNU General Public License as published by         */
+/*      the Free Software Foundation; either version 3 of the License                */
+/*                                                                                   */
+/*      This program is distributed in the hope that it will be useful,              */
+/*      but WITHOUT ANY WARRANTY; without even the implied warranty of               */
+/*      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                */
+/*      GNU General Public License for more details.                                 */
+/*                                                                                   */
+/*      You should have received a copy of the GNU General Public License            */
+/*	    along with this program. If not, see <http://www.gnu.org/licenses/>.         */
+/*                                                                                   */
+/*************************************************************************************/
+
+namespace Thelia\Tests\Rewriting;
+use Thelia\Model\Category;
+
+
+/**
+ * Class CategoryRewritingTest
+ * @package Thelia\Tests\Rewriting
+ * @author Manuel Raynaud <mraynaud@openstudio.fr>
+ */
+class CategoryRewritingTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @covers Thelia\Model\Tools\UrlRewritingTrait::generateRewrittenUrl
+     */
+    public function testSimpleFrenchRewrittenUrl()
+    {
+        $category = new Category();
+        $category->setVisible(1)
+            ->setPosition(1)
+            ->setLocale('fr_FR')
+            ->setTitle('Mon super titre en français')
+            ->save();
+
+        $this->assertRegExp('/^mon-super-titre-en-français(-[0-9]+)?\.html$/', $category->getRewrittenUrl('fr_FR'));
+
+        $rewrittenUrl = $category->generateRewrittenUrl('fr_FR');
+        $this->assertNotNull($rewrittenUrl, "rewritten url can not be null");
+        $this->assertRegExp('/^mon-super-titre-en-français(-[0-9]+)?\.html$/', $rewrittenUrl);
+        //mon-super-titre-en-français-2.html
+
+        $category->delete();
+    }
+
+    /**
+     * @covers Thelia\Model\Tools\UrlRewritingTrait::generateRewrittenUrl
+     */
+    public function testSimpleEnglishRewrittenUrl()
+    {
+        $category = new Category();
+        $category->setVisible(1)
+            ->setPosition(1)
+            ->setLocale('en_US')
+            ->setTitle('My english super Title')
+            ->save();
+
+        $this->assertRegExp('/^my-english-super-title(-[0-9]+)?\.html$/', $category->getRewrittenUrl('en_US'));
+
+        $rewrittenUrl = $category->generateRewrittenUrl('en_US');
+        $this->assertNotNull($rewrittenUrl, "rewritten url can not be null");
+        $this->assertRegExp('/^my-english-super-title(-[0-9]+)?\.html$/', $rewrittenUrl);
+
+        $category->delete();
+    }
+
+    /**
+     * @covers Thelia\Model\Tools\UrlRewritingTrait::generateRewrittenUrl
+     * @expectedException \RuntimeException
+     * @expectedExceptionMessage Impossible to create an url if title is null
+     */
+    public function testRewrittenWithoutTitle()
+    {
+        $category = new Category();
+        $category->setVisible(1)
+            ->setPosition(1)
+            ->setLocale('en_US')
+            ->setDescription('My english super Description')
+            ->save();
+    }
+
+    /**
+     * @covers Thelia\Model\Tools\UrlRewritingTrait::generateRewrittenUrl
+     * @expectedException \RuntimeException
+     * @expectedExceptionMessage Object category must be saved before generating url
+     */
+    public function testOnNotSavedProduct()
+    {
+        $product = new Category();
+
+        $product->generateRewrittenUrl('fr_FR');
+    }
+}
\ No newline at end of file
diff --git a/core/lib/Thelia/Tests/Rewriting/ProductRewriteTest.php b/core/lib/Thelia/Tests/Rewriting/ProductRewriteTest.php
index 39590fb8a..1c7a7ae45 100644
--- a/core/lib/Thelia/Tests/Rewriting/ProductRewriteTest.php
+++ b/core/lib/Thelia/Tests/Rewriting/ProductRewriteTest.php
@@ -79,6 +79,11 @@ class ProductRewriteTest extends \PHPUnit_Framework_TestCase
         $product->delete();
     }
 
+    /**
+     * @covers Thelia\Model\Tools\UrlRewritingTrait::generateRewrittenUrl
+     * @expectedException \RuntimeException
+     * @expectedExceptionMessage Impossible to create an url if title is null
+     */
     public function testRewrittenWithoutTitle()
     {
         $product = new Product();
@@ -88,14 +93,6 @@ class ProductRewriteTest extends \PHPUnit_Framework_TestCase
             ->setLocale('en_US')
             ->setDescription('My english super Description')
             ->save();
-
-        $this->assertEquals(strtolower(sprintf('%s.html', $product->getRef())), $product->getRewrittenUrl('en_US'));
-
-        $rewrittenUrl = $product->generateRewrittenUrl('en_US');
-        $this->assertNotNull($rewrittenUrl, "rewritten url can not be null");
-        $this->assertEquals(strtolower(sprintf('%s-1.html', $product->getRef())), $rewrittenUrl);
-
-        $product->delete();
     }
 
     /**