--- loncom/lonnet/perl/lonnet.pm	2011/09/01 02:47:57	1.1131
+++ loncom/lonnet/perl/lonnet.pm	2011/09/16 22:24:01	1.1132
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1131 2011/09/01 02:47:57 raeburn Exp $
+# $Id: lonnet.pm,v 1.1132 2011/09/16 22:24:01 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -3986,7 +3986,7 @@ sub hashref2str {
       $result.='=';
       #print("Got a ref of ".(ref($key))." skipping.");
     } else {
-	if ($key) {$result.=&escape($key).'=';} else { last; }
+	if (defined($key)) {$result.=&escape($key).'=';} else { last; }
     }
 
     if(ref($hashref->{$key}) eq 'ARRAY') {