1.1 --- a/docbook/src/org/netbeans/modules/docbook/DocBookNavigatorPanel.java	Tue May 01 12:16:05 2012 -0400
     1.2 +++ b/docbook/src/org/netbeans/modules/docbook/DocBookNavigatorPanel.java	Mon May 07 17:33:40 2012 -0400
     1.3 @@ -199,7 +199,9 @@
     1.4                  callback = new ContentCallback(obj);
     1.5                  ParsingService serv = current.getNodeDelegate().getLookup().lookup(
     1.6                      ParsingService.class);
     1.7 +                if (serv != null) { // #212111
     1.8                  serv.register(callback);
     1.9 +                }
    1.10              } else {
    1.11                  callback = null;
    1.12                  setItems (null);