--- loncom/homework/radiobuttonresponse.pm	2004/12/23 17:08:22	1.97
+++ loncom/homework/radiobuttonresponse.pm	2005/01/10 19:21:57	1.98
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # mutliple choice style responses
 #
-# $Id: radiobuttonresponse.pm,v 1.97 2004/12/23 17:08:22 albertel Exp $
+# $Id: radiobuttonresponse.pm,v 1.98 2005/01/10 19:21:57 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -606,7 +606,10 @@ sub end_foil {
 	my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
 	if ($value ne 'unused') {
 	    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
-	    if (!$name) { $name=$Apache::lonxml::curdepth; }
+	    if (!$name) {
+		&Apache::lonxml::error("Foils without names exist. This can cause problems to malfunction.");
+		$name=$Apache::lonxml::curdepth;
+	    }
 	    if (defined($Apache::response::foilnames{$name})) {
 		&Apache::lonxml::error(&mt("Foil name <b><tt>[_1]</tt></b> appears more than once. Foil names need to be unique.",$name));
 	    }