diff --git a/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/sample/SampleRegistrationRequest.java b/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/sample/SampleRegistrationRequest.java
index 2492be81f..8a649ab9c 100644
--- a/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/sample/SampleRegistrationRequest.java
+++ b/projectmanagement/src/main/java/life/qbic/projectmanagement/domain/project/sample/SampleRegistrationRequest.java
@@ -33,7 +33,7 @@ public SampleRegistrationRequest(String label, BatchId assignedBatch, Experiment
     this.experimentalGroupId = Objects.requireNonNull(experimentalGroupId);
     this.replicateReference = Objects.requireNonNull(replicateReference);
     this.sampleOrigin = Objects.requireNonNull(sampleOrigin);
-    this.comment = comment == null ? "" : comment;
-    this.analysisType = analysisType == null ? "" : analysisType;
+    this.comment = comment;
+    this.analysisType = analysisType;
   }
 }