diff --git a/source/engine/threejs/threeutils.js b/source/engine/threejs/threeutils.js
index 65e9a48..057d572 100644
--- a/source/engine/threejs/threeutils.js
+++ b/source/engine/threejs/threeutils.js
@@ -197,6 +197,7 @@ export function DisposeThreeObjects (mainObject)
             } else {
                 obj.material.dispose ();
             }
+            obj.userData = null;
             obj.geometry.dispose ();
         }
     });