Index: /trunk/src/org/openstreetmap/josm/gui/DefaultNameFormatter.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/DefaultNameFormatter.java	(revision 2463)
+++ /trunk/src/org/openstreetmap/josm/gui/DefaultNameFormatter.java	(revision 2464)
@@ -139,5 +139,6 @@
             String nodes = trn("{0} node", "{0} nodes", nodesNo, nodesNo);
             name += (name.length() > 0) ? " ("+nodes+")" : nodes;
-            if(way.getDataSet().getErrors(way) != null) {
+            DataSet data = way.getDataSet();
+            if (data != null && data.getErrors(way) != null) {
                 name = "*"+name;
             }