--- loncom/interface/spreadsheet/Spreadsheet.pm	2005/05/17 20:17:03	1.51
+++ loncom/interface/spreadsheet/Spreadsheet.pm	2005/06/23 17:55:01	1.52
@@ -1,5 +1,5 @@
 #
-# $Id: Spreadsheet.pm,v 1.51 2005/05/17 20:17:03 albertel Exp $
+# $Id: Spreadsheet.pm,v 1.52 2005/06/23 17:55:01 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1658,8 +1658,14 @@ sub load {
 	$self->formulas($formulas);
 	$self->set_row_sources();
 	$self->set_row_numbers();
-	%{$spreadsheets{$cachekey}->{'row_source'}} = %{$self->{'row_source'}};
-        %{$spreadsheets{$cachekey}->{'row_numbers'}} = %{$self->{'row_numbers'}};
+	if (ref($self->{'row_source'})) {
+	    %{$spreadsheets{$cachekey}->{'row_source'}} = 
+		%{$self->{'row_source'}};
+	}
+	if (ref($self->{'row_numbers'})) {
+	    %{$spreadsheets{$cachekey}->{'row_numbers'}} = 
+		%{$self->{'row_numbers'}};
+	}
         $spreadsheets{$cachekey}->{'maxrow'} = $self->{'maxrow'};
     }
 }