diff --git a/src/feedback/models/base.py b/src/feedback/models/base.py
index ac6645c..60b5397 100644
--- a/src/feedback/models/base.py
+++ b/src/feedback/models/base.py
@@ -579,7 +579,7 @@ def get_evasys_list_veranstalter(self):
         if self.primaerdozent is not None:
             personen.append(self.primaerdozent)
         for per in self.ergebnis_empfaenger.all():
-            if per.pk != self.primaerdozent.pk:
+            if self.primaerdozent is None or per.pk != self.primaerdozent.pk:
                 personen.append(per)
         return personen