diff --git a/Example/ExampleNodeGraph.asset b/Example/ExampleNodeGraph.asset
new file mode 100644
index 0000000..3818860
Binary files /dev/null and b/Example/ExampleNodeGraph.asset differ
diff --git a/Example/ExampleNodeGraph.asset.meta b/Example/ExampleNodeGraph.asset.meta
new file mode 100644
index 0000000..723ec56
--- /dev/null
+++ b/Example/ExampleNodeGraph.asset.meta
@@ -0,0 +1,9 @@
+fileFormatVersion: 2
+guid: 5398d565241ec2d489f41c368ca6cf24
+timeCreated: 1507498811
+licenseType: Free
+NativeFormatImporter:
+  mainObjectFileID: 11400000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Scripts/NodeGraph.cs b/Scripts/NodeGraph.cs
index 9e3c7d8..58baa23 100644
--- a/Scripts/NodeGraph.cs
+++ b/Scripts/NodeGraph.cs
@@ -18,7 +18,10 @@ public abstract class NodeGraph : ScriptableObject, ISerializationCallbackReceiv
     public virtual Node AddNode(Type type) {
         Node node = ScriptableObject.CreateInstance(type) as Node;
 #if UNITY_EDITOR
-        UnityEditor.AssetDatabase.AddObjectToAsset(node, this);
+        if (!Application.isPlaying) {
+            UnityEditor.AssetDatabase.AddObjectToAsset(node, this);
+            UnityEditor.AssetDatabase.SaveAssets();
+        }
 #endif
         nodes.Add(node);
         node.graph = this;
@@ -29,6 +32,12 @@ public abstract class NodeGraph : ScriptableObject, ISerializationCallbackReceiv
     /// <param name="node"></param>
     public void RemoveNode(Node node) {
         node.ClearConnections();
+#if UNITY_EDITOR
+        if (!Application.isPlaying) {
+            DestroyImmediate(node, true);
+            UnityEditor.AssetDatabase.SaveAssets();
+        }
+#endif
         nodes.Remove(node);
     }