diff --git a/src/AasxPackageLogic/MainWindowHeadless.cs b/src/AasxPackageLogic/MainWindowHeadless.cs
index 616eea2f..1afb8425 100644
--- a/src/AasxPackageLogic/MainWindowHeadless.cs
+++ b/src/AasxPackageLogic/MainWindowHeadless.cs
@@ -995,6 +995,7 @@ record = rec;
                     }
 
                     // ok, add
+                    ticket.Env.ConceptDescriptions ??= new List<IConceptDescription>();
                     ticket.Env.ConceptDescriptions.Add(cdres);
                     createdCds++;
                 }