diff --git a/src/Tree/Controllers/TreeController.cs b/src/Tree/Controllers/TreeController.cs
index 166dddfa812c52a0f7ed0cb0c378f699159e290d..54df26b7bc6d69c4b3679eba6c9fc951050b6c3f 100644
--- a/src/Tree/Controllers/TreeController.cs
+++ b/src/Tree/Controllers/TreeController.cs
@@ -342,8 +342,6 @@ namespace Coscine.Api.Tree.Controllers
                 {
                     BaseUri = graphNameUri
                 };
-
-                tempGraph = new Graph();
                 StringParser.Parse(tempGraph, metadataObject.Value<string>("metadata"), MimeTypesHelper.GetParser(mimeType));
                 var triplesList = tempGraph.Triples.ToArray();
                 var subjectNode = tempGraph.CreateUriNode(graphNameUri);