--- loncom/interface/spreadsheet/assesscalc.pm	2004/02/03 22:44:02	1.32
+++ loncom/interface/spreadsheet/assesscalc.pm	2004/02/24 20:47:14	1.33
@@ -1,5 +1,5 @@
 #
-# $Id: assesscalc.pm,v 1.32 2004/02/03 22:44:02 matthew Exp $
+# $Id: assesscalc.pm,v 1.33 2004/02/24 20:47:14 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -876,6 +876,10 @@ sub load_cached_export_rows {
         # We only got one key, so we will access it directly.
         while (my ($key,$sheetdata) = each(%tmp)) {
             my ($sname,$sdom,$sheettype,$symb) = split(':',$key);
+            if (! defined($sname) || $sname eq '' ||
+                ! defined($sdom)  || $sdom eq '' ) {
+                next;
+            }
             if ($symb =~ /\.time$/) {
                 $symb =~ s/\.time$//;
                 $Exportrows{$symb}->{'time'} = $sheetdata;