diff --git a/core/apps/projects/serializers/project.py b/core/apps/projects/serializers/project.py
index df9d843..c0297a2 100644
--- a/core/apps/projects/serializers/project.py
+++ b/core/apps/projects/serializers/project.py
@@ -284,7 +284,7 @@ class ProjectDetailSerialzier(serializers.ModelSerializer):
         return {
             'id': obj.builder.id,
             'name': obj.builder.name
-        }
+        } if obj.builder else None
 
 
 class ProjectsSerializer(serializers.ModelSerializer):