diff --git a/public/main/exercise/exercise.class.php b/public/main/exercise/exercise.class.php
index 81fa594fa2..157c1cf04a 100644
--- a/public/main/exercise/exercise.class.php
+++ b/public/main/exercise/exercise.class.php
@@ -6537,7 +6537,7 @@ class Exercise
         $course = api_get_course_entity($this->course_id);
         $link = $exercise->getFirstResourceLinkFromCourseSession($course);
 
-        if ($link->isDraft()) {
+        if ($link && $link->isDraft()) {
             $this->active = 0;
         }