diff --git a/core/apps/finance/serializers/expence_contract.py b/core/apps/finance/serializers/expence_contract.py
index 809152a..93780af 100644
--- a/core/apps/finance/serializers/expence_contract.py
+++ b/core/apps/finance/serializers/expence_contract.py
@@ -51,7 +51,7 @@ class ExpenceContractSerializer(serializers.ModelSerializer):
         return {
             'id': obj.project_folder.id,
             'name': obj.project_folder.name
-        }
+        } if obj.project_folder else None
 
 
     def create(self, validated_data):