--- loncom/interface/loncreateuser.pm	2008/12/18 16:58:26	1.270
+++ loncom/interface/loncreateuser.pm	2008/12/18 17:27:49	1.271
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Create a user
 #
-# $Id: loncreateuser.pm,v 1.270 2008/12/18 16:58:26 raeburn Exp $
+# $Id: loncreateuser.pm,v 1.271 2008/12/18 17:27:49 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2136,7 +2136,9 @@ sub update_user_data {
                                     $changeHash{'tools.'.$key};
                             }
                         }
-                        &Apache::lonnet::appenv(\%newenvhash);
+                        if (keys(%newenvhash)) {
+                            &Apache::lonnet::appenv(\%newenvhash);
+                        }
                     }
                 }
             }