--- a/mercurial/wireprotov2peer.py	Mon Aug 27 13:30:44 2018 -0700
+++ b/mercurial/wireprotov2peer.py	Wed Sep 05 09:06:40 2018 -0700
@@ -124,6 +124,8 @@
             else:
                 raise e
 
+            return
+
         if frame.requestid not in self._requests:
             raise error.ProgrammingError(
                 'received frame for unknown request; this is either a bug in '