diff -r c8177792fef6 -r b8ff7d0ff361 mercurial/statichttprepo.py
--- a/mercurial/statichttprepo.py	Thu Jun 08 21:54:30 2017 -0700
+++ b/mercurial/statichttprepo.py	Thu Jun 08 23:23:37 2017 -0700
@@ -127,6 +127,7 @@
         self._phasedefaults = []
 
         self.names = namespaces.namespaces()
+        self.filtername = None
 
         try:
             requirements = scmutil.readrequires(self.vfs, self.supported)