Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/sort/RelationNodeMap.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/sort/RelationNodeMap.java	(revision 7661)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/sort/RelationNodeMap.java	(revision 7662)
@@ -80,5 +80,5 @@
         for (int i = 0; i < members.size(); ++i) {
             RelationMember m = members.get(i);
-            if (m.getMember().isIncomplete() || !m.isWay()) {
+            if (m.getMember().isIncomplete() || !m.isWay() || m.getWay().getNodesCount() < 2) {
                 notSortable.add(i);
                 continue;