Index: trunk/src/org/openstreetmap/josm/tools/CopyList.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/CopyList.java	(revision 10313)
+++ trunk/src/org/openstreetmap/josm/tools/CopyList.java	(revision 10314)
@@ -166,4 +166,7 @@
         @Override
         public E next() {
+            if (!hasNext()) {
+                throw new NoSuchElementException();
+            }
             checkForComodification();
             try {