diff --git a/Scripts/Editor/NodeEditorAction.cs b/Scripts/Editor/NodeEditorAction.cs
index baf9400..67c50a7 100644
--- a/Scripts/Editor/NodeEditorAction.cs
+++ b/Scripts/Editor/NodeEditorAction.cs
@@ -413,6 +413,7 @@ namespace XNodeEditor {
         public void DuplicateSelectedNodes() {
             // Get selected nodes which are part of this graph
             XNode.Node[] selectedNodes = Selection.objects.Select(x => x as XNode.Node).Where(x => x != null && x.graph == graph).ToArray();
+            if (selectedNodes == null || selectedNodes.Length == 0) return;
             // Get top left node position
             Vector2 topLeftNode = selectedNodes.Select(x => x.position).Aggregate((x, y) => new Vector2(Mathf.Min(x.x, y.x), Mathf.Min(x.y, y.y)));
             InsertDuplicateNodes(selectedNodes, topLeftNode + new Vector2(30, 30));