Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/RelationEditor.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/RelationEditor.java	(revision 1367)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/RelationEditor.java	(revision 1368)
@@ -453,5 +453,5 @@
 
     private JButton createButton(String name, String iconName, String tooltip, int mnemonic, ActionListener actionListener) {
-        JButton b = new JButton(tr(name), ImageProvider.get("dialogs", iconName));
+        JButton b = new JButton((name == null) ? null : tr(name), ImageProvider.get("dialogs", iconName));
         b.setActionCommand(name);
         b.addActionListener(actionListener);