--- loncom/homework/grades.pm	2010/01/18 17:54:26	1.590
+++ loncom/homework/grades.pm	2010/01/27 06:26:55	1.591
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Grading handler
 #
-# $Id: grades.pm,v 1.590 2010/01/18 17:54:26 bisitz Exp $
+# $Id: grades.pm,v 1.591 2010/01/27 06:26:55 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -7451,6 +7451,7 @@ sub scantron_get_maxbubble {
         if (ref($nav_error)) {
             $$nav_error = 1;
         }
+        return;
     }
     my $map=$navmap->getResourceByUrl($sequence);
     my @resources=$navmap->retrieveResources($map,\&scantron_filter,1,0);