mercurial/changegroup.py

--- a/mercurial/changegroup.py	Sun Feb 28 22:51:07 2016 -0800
+++ b/mercurial/changegroup.py	Mon Feb 29 09:26:43 2016 -0800
@@ -376,6 +376,7 @@
                 clend = len(cl)
                 changesets = clend - clstart
                 repo.ui.progress(_('changesets'), None)
+                self.callback = None
 
                 # pull off the manifest group
                 repo.ui.status(_("adding manifests\n"))