1.1 --- a/masterfs/src/org/netbeans/modules/masterfs/filebasedfs/fileobjects/FileObjectFactory.java	Mon Apr 19 11:43:29 2010 +0200
     1.2 +++ b/masterfs/src/org/netbeans/modules/masterfs/filebasedfs/fileobjects/FileObjectFactory.java	Mon Apr 19 11:52:24 2010 +0200
     1.3 @@ -492,7 +492,7 @@
     1.4              BaseFileObj fo = null;
     1.5              if (slow != null) {
     1.6                  BaseFileObj pref = slow.preferrable();
     1.7 -                if (all2Refresh.remove(pref)) {
     1.8 +                if (pref != null && all2Refresh.remove(pref)) {
     1.9                      LOG_REFRESH.log(Level.FINER, "Preferring {0}", pref);
    1.10                      fo = pref;
    1.11                      it = all2Refresh.iterator();