diff --git a/hgext/chgserver.py b/hgext/chgserver.py
--- a/hgext/chgserver.py
+++ b/hgext/chgserver.py
@@ -638,6 +638,7 @@ class AutoExitMixIn:  # use old-style to
 
 class chgunixservice(commandserver.unixservice):
     def init(self):
+        self.repo = None
         self._inithashstate()
         self._checkextensions()
         class cls(AutoExitMixIn, SocketServer.ForkingMixIn,