diff --git a/rapids/models.py b/rapids/models.py
index 5e5ff1da..68384d2b 100644
--- a/rapids/models.py
+++ b/rapids/models.py
@@ -399,7 +399,7 @@ class Exam(ExamBase):
         if self.time_limit:
             exam_json["exam_time"] = self.time_limit
 
-        return
+        return exam_json
 
 
 class CidUserAnswer(models.Model):