diff -r f1c49bc79b4d -r 3fd6ec54704c mercurial/localrepo.py
--- a/mercurial/localrepo.py	Sat Nov 23 13:59:17 2019 +0100
+++ b/mercurial/localrepo.py	Sat Nov 23 16:49:34 2019 -0800
@@ -1531,7 +1531,7 @@
             ]
 
         # dealing with some special values
-        if changeid == b'null' or changeid == nullrev:
+        if changeid == b'null' or changeid == nullrev or changeid == nullid:
             return context.changectx(self, nullrev, nullid, maybe_filtered=False)
         if changeid == b'tip':
             node = self.changelog.tip()