diff --git a/main/exercice/exercise.class.php b/main/exercice/exercise.class.php
index 577aaf7f3e..25edb43011 100644
--- a/main/exercice/exercise.class.php
+++ b/main/exercice/exercise.class.php
@@ -163,9 +163,10 @@ class Exercise
      * @todo use Doctrine to manage read/writes
      * @param int $id - exercise ID
      * @param bool parse exercise question list
+     * @param int $chamilo_session_id - chamilo session ID
      * @return boolean - true if exercise exists, otherwise false
      */
-    public function read($id, $parseQuestionList = true)
+    public function read($id, $parseQuestionList = true, $chamilo_session_id = null)
     {
         if (empty($this->course_id)) {
             return false;
@@ -243,7 +244,7 @@ class Exercise
             $this->trackExercise = $this->getStatTrackExerciseInfo();
 
             if ($parseQuestionList) {
-                $this->setQuestionList($this->loadDistributions);
+                $this->setQuestionList($this->loadDistributions, $chamilo_session_id);
             }
             return true;
         }
@@ -849,7 +850,8 @@ class Exercise
         $questionsPerMainCategory = array();
         foreach ($temp_question_list as $categoryId => $questionList) {
             $parentId = $categoriesAddedInExercise[$categoryId]['parent_id'];
-            $cat = new Testcategory();
+            // Default values and the course_id passed.
+            $cat = new Testcategory(0, '', '', 0, 'simple', $this->course_id);
             $cat->getCategory($parentId);
 
             if (!isset($questionsPerMainCategory[$cat->parent_id])) {
@@ -885,8 +887,8 @@ class Exercise
             'category_with_questions_list' => array()
         );
 
-        // Order/random categories
-        $cat = new Testcategory();
+        // Order/random categories. Default values and the course_id passed.
+        $cat = new Testcategory(0, '', '', 0, 'simple', $this->course_id);
 
         $courseId = $this->course_id;
 
@@ -1047,7 +1049,8 @@ class Exercise
 
         if (!empty($questions_by_category)) {
             foreach ($questions_by_category as $categoryId => $questionList) {
-                $cat = new Testcategory($categoryId);
+                // Default values and the course_id passed.
+                $cat = new Testcategory($categoryId, '', '', 0, 'simple', $this->course_id);
                 $cat = (array)$cat;
                 $cat['iid'] = $cat['id'];
                 $cat['name'] = $cat['title'];
@@ -2968,7 +2971,8 @@ class Exercise
         $safe_lp_item_id = 0,
         $safe_lp_item_view_id = 0,
         $questionList = array(),
-        $weight = 0
+        $weight = 0,
+        $chamilo_session_id = null
     ) {
         $track_exercises = Database :: get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
         $safe_lp_id = intval($safe_lp_id);
@@ -2994,10 +2998,13 @@ class Exercise
         $questionList = array_map('intval', $questionList);
 
         $weight = Database::escape_string($weight);
+        if (!$chamilo_session_id) {
+            $chamilo_session_id = api_get_session_id();
+        }
         $sql = "INSERT INTO $track_exercises
                 ($sql_fields exe_exo_id, exe_user_id, c_id, status, session_id, data_tracking, start_date, orig_lp_id, orig_lp_item_id, exe_weighting, quiz_distribution_id)
                 VALUES
-                ( $sql_fields_values '".$this->id."','".api_get_user_id()."','".api_get_course_int_id()."', 'incomplete','".api_get_session_id()."','".implode(',', $questionList)."', '".api_get_utc_datetime()."', '$safe_lp_id', '$safe_lp_item_id', '$weight', '".$this->distributionId."')";
+                ( $sql_fields_values '".$this->id."','".api_get_user_id()."','".$this->course_id."', 'incomplete','".$chamilo_session_id."','".implode(',', $questionList)."', '".api_get_utc_datetime()."', '$safe_lp_id', '$safe_lp_item_id', '$weight', '".$this->distributionId."')";
         Database::query($sql);
         $id = Database::insert_id();
 
@@ -5595,13 +5602,15 @@ class Exercise
     /**
      * Sets the question list when the exercise->read() is executed
      */
-    public function setQuestionList($loadDistributions = false)
+    public function setQuestionList($loadDistributions = false, $sessionId = null)
     {
         // Getting question list.
         $questionList = $this->selectQuestionList(true);
 
         // Looking for distributions
-        $sessionId = api_get_session_id();
+        if (!$sessionId) {
+            $sessionId = api_get_session_id();
+        }
         if (!empty($sessionId)) {
 
             $dataExists = !empty($this->trackExercise) && isset($this->trackExercise['data_tracking']) && !empty($this->trackExercise['data_tracking']) ? true : false;
diff --git a/main/exercice/exercise.lib.php b/main/exercice/exercise.lib.php
index 17ccfa86e9..aabf9e4572 100644
--- a/main/exercice/exercise.lib.php
+++ b/main/exercice/exercise.lib.php
@@ -789,8 +789,10 @@ function get_exercise_track_exercise_info($exe_id) {
 /**
  * Validates the time control key
  */
-function exercise_time_control_is_valid($exercise_id, $lp_id = 0 , $lp_item_id = 0) {
-    $course_id = api_get_course_int_id();
+function exercise_time_control_is_valid($exercise_id, $lp_id = 0 , $lp_item_id = 0, $course_id = null) {
+    if (!$course_id) {
+        $course_id = api_get_course_int_id();
+    }
     $exercise_id = intval($exercise_id);
     $TBL_EXERCICES =  Database::get_course_table(TABLE_QUIZ_TEST);
     $sql 	= "SELECT expired_time FROM $TBL_EXERCICES WHERE c_id = $course_id AND id = $exercise_id";
diff --git a/main/exercice/testcategory.class.php b/main/exercice/testcategory.class.php
index 77ddb50429..d4c0dcf166 100644
--- a/main/exercice/testcategory.class.php
+++ b/main/exercice/testcategory.class.php
@@ -36,7 +36,7 @@ class Testcategory
     public function Testcategory($in_id = 0, $in_name = '', $in_description = "", $parent_id = 0, $type = 'simple', $course_id = null, $visibility = 1)
     {
         if ($in_id != 0 && $in_name == "") {
-            $tmpobj = new Testcategory();
+            $tmpobj = new Testcategory(0, '', '', 0, 'simple', $course_id);
             $tmpobj->getCategory($in_id);
             $this->id = $tmpobj->id;
             $this->name = $tmpobj->name;
@@ -44,12 +44,13 @@ class Testcategory
             $this->description = $tmpobj->description;
             $this->parent_id = $tmpobj->parent_id;
             $this->parent_path = $this->name;
-            $this->c_id = $tmpobj->c_id;
+            $this->c_id = isset($course_id) ? $course_id : $tmpobj->c_id;
             $this->root = $tmpobj->root;
             $this->visibility = $tmpobj->visibility;
 
             if (!empty($tmpobj->parent_id)) {
-                $category = new Testcategory($tmpobj->parent_id);
+                // Default values and the course_id passed.
+                $category = new Testcategory($tmpobj->parent_id, '', '', 0, 'simple', $course_id);
                 $this->parent_path = $category->parent_path.' > '.$this->name;
             }
         } else {
diff --git a/main/inc/lib/events.lib.inc.php b/main/inc/lib/events.lib.inc.php
index dc29e5903e..d2a926021e 100644
--- a/main/inc/lib/events.lib.inc.php
+++ b/main/inc/lib/events.lib.inc.php
@@ -493,7 +493,7 @@ function saveQuestionAttempt(
     }
 
     //Validation in case of fraud with active control time
-    if (!ExerciseLib::exercise_time_control_is_valid($exercise_id, $learnpath_id, $learnpath_item_id)) {
+    if (!ExerciseLib::exercise_time_control_is_valid($exercise_id, $learnpath_id, $learnpath_item_id, $course_id, $session_id)) {
         if ($debug) {
             error_log("exercise_time_control_is_valid is false");
         }
diff --git a/main/inc/lib/exercise.lib.php b/main/inc/lib/exercise.lib.php
index a916bbd75d..9b0619693a 100644
--- a/main/inc/lib/exercise.lib.php
+++ b/main/inc/lib/exercise.lib.php
@@ -48,16 +48,21 @@ class ExerciseLib
     /**
      * Validates the time control key
      */
-    public static function exercise_time_control_is_valid($exercise_id, $lp_id = 0, $lp_item_id = 0)
+    public static function exercise_time_control_is_valid($exercise_id, $lp_id = 0, $lp_item_id = 0, $course_id = null, $session_id = null)
     {
-        $course_id = api_get_course_int_id();
+        if (!$course_id) {
+            $course_id = api_get_course_int_id();
+        }
+        if (!$session_id) {
+            $session_id = api_get_session_id();
+        }
         $exercise_id = intval($exercise_id);
         $TBL_EXERCICES = Database::get_course_table(TABLE_QUIZ_TEST);
         $sql = "SELECT expired_time FROM $TBL_EXERCICES WHERE c_id = $course_id AND iid = $exercise_id";
         $result = Database::query($sql);
         $row = Database::fetch_array($result, 'ASSOC');
         if (!empty($row['expired_time'])) {
-            $current_expired_time_key = ExerciseLib::get_time_control_key($exercise_id, $lp_id, $lp_item_id);
+            $current_expired_time_key = ExerciseLib::get_time_control_key($exercise_id, $lp_id, $lp_item_id, $course_id, $session_id);
             if (isset($_SESSION['expired_time'][$current_expired_time_key])) {
                 $current_time = time();
                 $expired_time = api_strtotime($_SESSION['expired_time'][$current_expired_time_key], 'UTC');
@@ -88,12 +93,18 @@ class ExerciseLib
     /**
       Generates the time control key
      */
-    public static function get_time_control_key($exercise_id, $lp_id = 0, $lp_item_id = 0)
+    public static function get_time_control_key($exercise_id, $lp_id = 0, $lp_item_id = 0, $course_id = null, $session_id = null)
     {
         $exercise_id = intval($exercise_id);
         $lp_id = intval($lp_id);
         $lp_item_id = intval($lp_item_id);
-        return api_get_course_int_id().'_'.api_get_session_id().'_'.$exercise_id.'_'.api_get_user_id().'_'.$lp_id.'_'.$lp_item_id;
+        if (!$course_id) {
+            $course_id = api_get_course_int_id();
+        }
+        if (!$session_id) {
+            $session_id = api_get_session_id();
+        }
+        return $course_id.'_'.$session_id.'_'.$exercise_id.'_'.api_get_user_id().'_'.$lp_id.'_'.$lp_item_id;
     }
 
     /**