--- loncom/interface/slotrequest.pm	2006/05/12 01:20:31	1.60
+++ loncom/interface/slotrequest.pm	2006/05/12 05:12:27	1.61
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for requesting to have slots added to a students record
 #
-# $Id: slotrequest.pm,v 1.60 2006/05/12 01:20:31 albertel Exp $
+# $Id: slotrequest.pm,v 1.61 2006/05/12 05:12:27 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -41,7 +41,8 @@ sub fail {
     my ($r,$code)=@_;
     if ($code eq 'not_valid') {
 	$r->print('<p>'.&mt('Unable to understand what resource you wanted to sign up for.').'</p>');
-
+    } elsif ($code eq 'not_available') {
+	$r->print('<p>'.&mt('No slots are available.').'</p>');
     } elsif ($code eq 'not_allowed') {
 	$r->print('<p>'.&mt('Not allowed to sign up or change reservations at this time.').'</p>');
     } else {
@@ -1550,10 +1551,14 @@ sub handler {
 	}
     } else {
 	my $symb=&Apache::lonnet::unescape($env{'form.symb'});
+	if (!defined($symb)) {
+	    &fail($r,'not_valid');
+	    return OK;
+	}
 	my (undef,undef,$res)=&Apache::lonnet::decode_symb($symb);
 	my $useslots = &Apache::lonnet::EXT("resource.0.useslots",$symb);
 	if ($useslots ne 'resource' && $useslots ne 'map') {
-	    &fail($r,'not_valid');
+	    &fail($r,'not_available');
 	    return OK;
 	}
 	$env{'request.symb'}=$symb;