--- loncom/homework/caparesponse/caparesponse.pm	2007/08/29 10:09:56	1.217
+++ loncom/homework/caparesponse/caparesponse.pm	2007/08/29 21:55:37	1.218
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # caparesponse definition
 #
-# $Id: caparesponse.pm,v 1.217 2007/08/29 10:09:56 foxr Exp $
+# $Id: caparesponse.pm,v 1.218 2007/08/29 21:55:37 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -431,6 +431,10 @@ sub check_submission {
     
     &add_in_tag_answer($parstack,$safeeval);
 
+    if (!%answer) {
+	&Apache::lonxml::error("No answers are defined");
+    }
+
     my (@final_awards,@final_msgs,@names);
     foreach my $name (keys(%answer)) {
 	&Apache::lonxml::debug(" doing $name with ".join(':',@{ $answer{$name}{'answers'} }));