Index: /trunk/src/org/openstreetmap/josm/gui/history/HistoryBrowserModel.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/history/HistoryBrowserModel.java	(revision 9672)
+++ /trunk/src/org/openstreetmap/josm/gui/history/HistoryBrowserModel.java	(revision 9673)
@@ -220,5 +220,6 @@
      */
     protected void initNodeListTableModels() {
-        if (current.getType() != OsmPrimitiveType.WAY || reference.getType() != OsmPrimitiveType.WAY)
+        if (current == null || current.getType() != OsmPrimitiveType.WAY
+         || reference == null || reference.getType() != OsmPrimitiveType.WAY)
             return;
         TwoColumnDiff diff = new TwoColumnDiff(