--- loncom/lonnet/perl/lonnet.pm	2020/09/28 00:10:29	1.1424
+++ loncom/lonnet/perl/lonnet.pm	2020/09/28 13:08:57	1.1425
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1424 2020/09/28 00:10:29 raeburn Exp $
+# $Id: lonnet.pm,v 1.1425 2020/09/28 13:08:57 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -13408,7 +13408,9 @@ sub symbread {
                              my @blockers = &has_comm_blocking('bre',$syval,$bighash{'src_'.$ids});
                              if (@blockers) {
                                  $syval = '';
-                                 return;
+                                 untie(%bighash);
+                                 return '' if ($nocache);
+                                 return $env{$cache_str}='';
                              }
                          }
                      }