Index: /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/DuplicateNode.java
===================================================================
--- /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/DuplicateNode.java	(revision 18342)
+++ /applications/editors/josm/plugins/validator/src/org/openstreetmap/josm/plugins/validator/tests/DuplicateNode.java	(revision 18343)
@@ -6,4 +6,5 @@
 import java.util.Collection;
 import java.util.LinkedList;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
@@ -109,5 +110,5 @@
     {
         Collection<OsmPrimitive> sel = new LinkedList<OsmPrimitive>(testError.getPrimitives());
-        LinkedList<Node> nodes = new LinkedList<Node>(OsmPrimitive.getFilteredList(sel, Node.class));
+        LinkedHashSet<Node> nodes = new LinkedHashSet<Node>(OsmPrimitive.getFilteredList(sel, Node.class));
         Node target = MergeNodesAction.selectTargetNode(nodes);
         if(checkAndConfirmOutlyingDeletes(nodes))
@@ -127,5 +128,5 @@
      * Request confirmation if he is.
      */
-    private static boolean checkAndConfirmOutlyingDeletes(LinkedList<Node> del) {
+    private static boolean checkAndConfirmOutlyingDeletes(LinkedHashSet<Node> del) {
         Area a = Main.main.getCurrentDataSet().getDataSourceArea();
         if (a != null) {