--- loncom/interface/lonparmset.pm	2004/04/01 15:12:27	1.152
+++ loncom/interface/lonparmset.pm	2004/04/12 20:03:31	1.153
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler to set parameters for assessments
 #
-# $Id: lonparmset.pm,v 1.152 2004/04/01 15:12:27 albertel Exp $
+# $Id: lonparmset.pm,v 1.153 2004/04/12 20:03:31 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1499,7 +1499,7 @@ sub crsenv {
         }
         #
         # Let the user know we made the changes
-        if ($name) {
+        if ($name && defined($value)) {
             my $put_result = &Apache::lonnet::put('environment',
                                                   {$name=>$value},$dom,$crs);
             if ($put_result eq 'ok') {
@@ -1776,7 +1776,7 @@ ENDOVER
 		push (@deldata,$thiskey);
 	    } elsif ($cmd eq 'datepointer') {
 		my $data=&Apache::lonhtmlcommon::get_date_from_form($ENV{$_});
-		if ($olddata{$thiskey} ne $data) { $newdata{$thiskey}=$data; }
+		if (defined($data) and $olddata{$thiskey} ne $data) { $newdata{$thiskey}=$data; }
 	    }
 	}
     }