diff -r 781b2720d2ac -r a3dacabd476b mercurial/revlog.py
--- a/mercurial/revlog.py	Fri Jul 20 08:10:32 2018 -0700
+++ b/mercurial/revlog.py	Fri Jul 20 14:36:42 2018 -0700
@@ -792,7 +792,7 @@
 
 class revlogoldindex(list):
     def __getitem__(self, i):
-        if i == -1 or i == len(self):
+        if i == -1:
             return (0, 0, 0, -1, -1, -1, -1, nullid)
         return list.__getitem__(self, i)