diff --git a/core/apps/evaluation/serializers/auto/AutoEvaluation.py b/core/apps/evaluation/serializers/auto/AutoEvaluation.py
index 56ac56a..40b5a77 100644
--- a/core/apps/evaluation/serializers/auto/AutoEvaluation.py
+++ b/core/apps/evaluation/serializers/auto/AutoEvaluation.py
@@ -60,7 +60,7 @@ class BaseAutoevaluationSerializer(serializers.ModelSerializer):
             "first_name": obj.user.first_name,
             "last_name": obj.user.last_name,
             "avatar": request.build_absolute_uri(obj.user.avatar.url) if obj.user.avatar else None
-        }
+        } if obj.user else None
 
 
 class ListAutoevaluationSerializer(BaseAutoevaluationSerializer):