Index: applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/gui/OsbDialog.java
===================================================================
--- applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/gui/OsbDialog.java	(revision 22428)
+++ applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/gui/OsbDialog.java	(revision 22434)
@@ -308,5 +308,8 @@
     public void mouseClicked(MouseEvent e) {
         if (e.getButton() == MouseEvent.BUTTON1 && e.getClickCount() == 2) {
-            zoomToNode(getSelectedNode());
+            Node selectedNode = getSelectedNode();
+            if(selectedNode != null) {
+                zoomToNode(selectedNode);
+            }
         }
     }