--- loncom/interface/loncoursedata.pm	2004/06/29 04:30:00	1.136
+++ loncom/interface/loncoursedata.pm	2004/07/06 15:50:03	1.137
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: loncoursedata.pm,v 1.136 2004/06/29 04:30:00 raeburn Exp $
+# $Id: loncoursedata.pm,v 1.137 2004/07/06 15:50:03 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2530,7 +2530,15 @@ sub get_response_data {
     #
     &setup_table_names($courseid);
     my $symb_id = &get_symb_id($symb);
+    if (! defined($symb_id)) {
+        &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
+        return undef;
+    }
     my $response_id = &get_part_id($response);
+    if (! defined($response_id)) {
+        &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
+        return undef;
+    }
     #
     my $dbh = &Apache::lonmysql::get_dbh();
     return undef if (! defined($dbh));