Index: trunk/src/org/openstreetmap/josm/actions/JoinAreasAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/JoinAreasAction.java	(revision 14428)
+++ trunk/src/org/openstreetmap/josm/actions/JoinAreasAction.java	(revision 14429)
@@ -1379,4 +1379,6 @@
 
             for (RelationMember rm : r.getMembers()) {
+                if (!rm.isWay())
+                    continue;
                 if ("outer".equalsIgnoreCase(rm.getRole())) {
                     outerWays.add(rm.getWay());