diff --git a/public/main/gradebook/lib/fe/catform.class.php b/public/main/gradebook/lib/fe/catform.class.php
index ea658b1ba8..8350630a6c 100644
--- a/public/main/gradebook/lib/fe/catform.class.php
+++ b/public/main/gradebook/lib/fe/catform.class.php
@@ -5,8 +5,6 @@
 use Chamilo\CourseBundle\Entity\CDocument;
 
 /**
- * Class CatForm.
- *
  * @author Stijn Konings
  */
 class CatForm extends FormValidator
@@ -281,7 +279,7 @@ class CatForm extends FormValidator
             $defaultCertification = $this->category_object->getCertificateMinScore();
         }
 
-        if (isset($this->category_object) &&
+        if (!empty($this->category_object) &&
             0 == $this->category_object->get_parent_id()
         ) {
             $model = ExerciseLib::getCourseScoreModel();
@@ -341,7 +339,7 @@ class CatForm extends FormValidator
             get_lang('Description')
         );
 
-        if (isset($this->category_object) &&
+        if (!empty($this->category_object) &&
             0 == $this->category_object->get_parent_id() &&
             (api_is_platform_admin() || 'true' === api_get_setting('teachers_can_change_grade_model_settings'))
         ) {
diff --git a/public/main/inc/lib/api.lib.php b/public/main/inc/lib/api.lib.php
index b763807432..b6f45c8d27 100644
--- a/public/main/inc/lib/api.lib.php
+++ b/public/main/inc/lib/api.lib.php
@@ -5048,10 +5048,11 @@ function api_request_uri()
     return $uri;
 }
 
-/** Gets the current access_url id of the Chamilo Platform.
+/**
+ * Gets the current access_url id of the Chamilo Platform.
+ * @return int access_url_id of the current Chamilo Installation
  * @author Julio Montoya <gugli100@gmail.com>
  *
- * @return int access_url_id of the current Chamilo Installation
  */
 function api_get_current_access_url_id()
 {