diff --git a/controllers/admin/AdminCategoriesController.php b/controllers/admin/AdminCategoriesController.php
index 62985c53b..3a465fdcb 100644
--- a/controllers/admin/AdminCategoriesController.php
+++ b/controllers/admin/AdminCategoriesController.php
@@ -440,7 +440,7 @@ class AdminCategoriesControllerCore extends AdminController
 					'name' => 'link_rewrite',
 					'lang' => true,
 					'required' => true,
-					'hint' => $this->l('Forbidden characters:').' <>;=#{}'
+					'hint' => $this->l('Forbidden characters:').' <>;=#{}%'
 				),
 				array(
 					'type' => 'group',
@@ -544,7 +544,7 @@ class AdminCategoriesControllerCore extends AdminController
 		$object = parent::processAdd();
 		
 		//if we create a you root category you have to associate to a shop before to add sub categories in. So we redirect to AdminCategories listing
-		if (Tools::isSubmit('is_root_category'))
+		if ($object && Tools::isSubmit('is_root_category'))
 			Tools::redirectAdmin(self::$currentIndex.'&token='.Tools::getAdminTokenLite('AdminCategories').'&conf=3');
 
 		return $object;
diff --git a/js/admin.js b/js/admin.js
index 1bd5946b8..ca3893428 100644
--- a/js/admin.js
+++ b/js/admin.js
@@ -51,7 +51,7 @@ function str2url(str,encoding,ucfirst)
 
 function copy2friendlyURL()
 {
-	$('#link_rewrite_' + id_language).val(str2url($('#name_' + id_language).val().replace(/^[0-9]+\./, ''), 'UTF-8'));
+	$('#link_rewrite_' + id_language).val(str2url($('#name_' + id_language).val().replace(/^[0-9]+\./, ''), 'UTF-8').replace('%', ''));
 	if ($('#friendly-url'))
 		$('#friendly-url').html($('#link_rewrite_' + id_language).val());
 	// trigger onchange event to use anything binded there