diff -r 5fa019ceb499 -r d55b71393907 mercurial/filelog.py
--- a/mercurial/filelog.py	Mon Apr 19 20:38:52 2021 -0400
+++ b/mercurial/filelog.py	Mon Mar 29 01:52:06 2021 +0200
@@ -8,10 +8,7 @@
 from __future__ import absolute_import
 
 from .i18n import _
-from .node import (
-    nullid,
-    nullrev,
-)
+from .node import nullrev
 from . import (
     error,
     revlog,
@@ -42,7 +39,7 @@
         return self._revlog.__iter__()
 
     def hasnode(self, node):
-        if node in (nullid, nullrev):
+        if node in (self.nullid, nullrev):
             return False
 
         try: