diff --git a/public/main/inc/lib/sortable_table.class.php b/public/main/inc/lib/sortable_table.class.php
index d0bc83c7b5..87fde30829 100644
--- a/public/main/inc/lib/sortable_table.class.php
+++ b/public/main/inc/lib/sortable_table.class.php
@@ -374,6 +374,7 @@ class SortableTable extends HTML_Table
         $table_id = 'form_'.$this->table_name.'_id';
         $html = '';
         $form = '';
+        $nav = '';
         if (false === $this->hideNavigation) {
             // Only show pagination if there are more than 1 page.
             if ($this->get_pager()->numPages() > 1) {
diff --git a/public/main/work/work.lib.php b/public/main/work/work.lib.php
index c48bda2dd2..0fc572cbc5 100644
--- a/public/main/work/work.lib.php
+++ b/public/main/work/work.lib.php
@@ -1470,10 +1470,9 @@ function getAllWorkListStudent(
     while ($work = Database::fetch_array($result, 'ASSOC')) {
         $courseId = $work['c_id'];
         $courseInfo = $courseList[$work['c_id']];
-        $courseCode = $courseInfo['code'];
         $sessionId = $work['session_id'];
 
-        $cidReq = api_get_cidreq_params($courseCode, $sessionId);
+        $cidReq = api_get_cidreq_params($courseId, $sessionId);
         $url = api_get_path(WEB_CODE_PATH).'work/work_list.php?'.$cidReq;
         $isSubscribed = userIsSubscribedToWork($userId, $work['iid'], $courseId);
         if (false == $isSubscribed) {
diff --git a/src/CoreBundle/Security/Authorization/Voter/ResourceVoter.php b/src/CoreBundle/Security/Authorization/Voter/ResourceVoter.php
index 5b3dbd553f..5509b92a31 100644
--- a/src/CoreBundle/Security/Authorization/Voter/ResourceVoter.php
+++ b/src/CoreBundle/Security/Authorization/Voter/ResourceVoter.php
@@ -8,7 +8,6 @@ namespace Chamilo\CoreBundle\Security\Authorization\Voter;
 
 use Chamilo\CoreBundle\Entity\AbstractResource;
 use Chamilo\CoreBundle\Entity\Course;
-use Chamilo\CoreBundle\Entity\ResourceNode;
 use Chamilo\CourseBundle\Entity\CGroup;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Security\Acl\Permission\MaskBuilder;
@@ -35,8 +34,7 @@ class ResourceVoter extends Voter
 
     public static function getReaderMask(): int
     {
-        $builder = new MaskBuilder();
-        $builder
+        $builder = (new MaskBuilder())
             ->add(self::VIEW)
         ;
 
@@ -45,8 +43,7 @@ class ResourceVoter extends Voter
 
     public static function getEditorMask(): int
     {
-        $builder = new MaskBuilder();
-        $builder
+        $builder = (new MaskBuilder())
             ->add(self::VIEW)
             ->add(self::EDIT)
         ;