Index: trunk/src/org/openstreetmap/josm/gui/widgets/OsmIdTextField.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/widgets/OsmIdTextField.java	(revision 5777)
+++ trunk/src/org/openstreetmap/josm/gui/widgets/OsmIdTextField.java	(revision 5778)
@@ -43,5 +43,5 @@
      */
     public final List<PrimitiveId> getIds() {
-        return validator.ids;
+        return new ArrayList<PrimitiveId>(validator.ids);
     }