diff -r ba21cfd9b044 -r 013c645dd28c mercurial/revlogutils/revlogv0.py
--- a/mercurial/revlogutils/revlogv0.py	Tue May 04 01:13:53 2021 +0200
+++ b/mercurial/revlogutils/revlogv0.py	Tue May 04 01:15:03 2021 +0200
@@ -42,7 +42,7 @@
 
 class revlogoldindex(list):
     entry_size = INDEX_ENTRY_V0.size
-    null_item = (0, 0, 0, -1, -1, -1, -1, node.nullid)
+    null_item = (0, 0, 0, -1, -1, -1, -1, sha1nodeconstants.nullid, 0, 0)
 
     @property
     def nodemap(self):