diff --git a/src/main/java/edu/kit/kastel/sdq/artemis4j/client/ProgrammingSubmissionDTO.java b/src/main/java/edu/kit/kastel/sdq/artemis4j/client/ProgrammingSubmissionDTO.java
index 7448bdc..352a983 100644
--- a/src/main/java/edu/kit/kastel/sdq/artemis4j/client/ProgrammingSubmissionDTO.java
+++ b/src/main/java/edu/kit/kastel/sdq/artemis4j/client/ProgrammingSubmissionDTO.java
@@ -75,7 +75,7 @@ public static void saveAssessment(ArtemisClient client, long participationId, bo
 
     public List<ResultDTO> nonAutomaticResults() {
         return this.results().stream()
-                .filter(r -> r.assessmentType() != AssessmentType.AUTOMATIC)
+                .filter(r -> r != null && r.assessmentType() != AssessmentType.AUTOMATIC)
                 .toList();
     }
 }