Index: trunk/src/org/openstreetmap/josm/gui/DefaultNameFormatter.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/DefaultNameFormatter.java	(revision 2462)
+++ trunk/src/org/openstreetmap/josm/gui/DefaultNameFormatter.java	(revision 2463)
@@ -14,4 +14,5 @@
 import org.openstreetmap.josm.data.coor.CoordinateFormat;
 import org.openstreetmap.josm.data.osm.Changeset;
+import org.openstreetmap.josm.data.osm.DataSet;
 import org.openstreetmap.josm.data.osm.NameFormatter;
 import org.openstreetmap.josm.data.osm.Node;
@@ -189,5 +190,6 @@
             int mbno = relation.getMembersCount();
             name += trn("{0} member", "{0} members", mbno, mbno) + ")";
-            if(relation.getDataSet().getErrors(relation) != null) {
+            DataSet data = relation.getDataSet();
+            if(data != null && data.getErrors(relation) != null) {
                 name = "*"+name;
             }