diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -930,6 +930,13 @@
         changedfiles = set()
         clrevtomanifestrev = {}
 
+        state = {
+            'clrevorder': clrevorder,
+            'manifests': manifests,
+            'changedfiles': changedfiles,
+            'clrevtomanifestrev': clrevtomanifestrev,
+        }
+
         # Callback for the changelog, used to collect changed files and
         # manifest nodes.
         # Returns the linkrev node (identity in the changelog case).
@@ -970,13 +977,6 @@
 
             return x
 
-        state = {
-            'clrevorder': clrevorder,
-            'manifests': manifests,
-            'changedfiles': changedfiles,
-            'clrevtomanifestrev': clrevtomanifestrev,
-        }
-
         gen = deltagroup(
             self._repo, cl, nodes, True, lookupcl,
             self._forcedeltaparentprev,