Index: trunk/src/org/openstreetmap/josm/gui/history/VersionInfoPanel.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/history/VersionInfoPanel.java	(revision 9679)
+++ trunk/src/org/openstreetmap/josm/gui/history/VersionInfoPanel.java	(revision 9680)
@@ -200,6 +200,8 @@
     public void update(Observable o, Object arg) {
         HistoryOsmPrimitive primitive = getPrimitive();
-        Changeset cs = primitive.getChangeset();
-        update(cs, model.isLatest(primitive), primitive.getTimestamp(), primitive.getVersion());
+        if (primitive != null) {
+            Changeset cs = primitive.getChangeset();
+            update(cs, model.isLatest(primitive), primitive.getTimestamp(), primitive.getVersion());
+        }
     }