diff --git a/src/main/java/ch/ethz/seb/sebserver/gbl/model/exam/Exam.java b/src/main/java/ch/ethz/seb/sebserver/gbl/model/exam/Exam.java
index 9cec7f43..abb8bfe2 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gbl/model/exam/Exam.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gbl/model/exam/Exam.java
@@ -281,7 +281,7 @@ public final class Exam implements GrantEntity {
             }
             return result;
         } else {
-            return null;
+            return Collections.emptyList();
         }
     }