Index: trunk/src/org/openstreetmap/josm/gui/history/VersionTable.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/history/VersionTable.java	(revision 8950)
+++ trunk/src/org/openstreetmap/josm/gui/history/VersionTable.java	(revision 8951)
@@ -311,5 +311,8 @@
         public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
                 int row, int column) {
-            String v = value.toString();
+            String v = "";
+            if (value != null) {
+                v = value.toString();
+            }
             setText(v);
             return this;