--- a/hgext/notify.py	Wed Apr 18 15:04:12 2018 +0200
+++ b/hgext/notify.py	Wed Apr 18 15:05:12 2018 +0200
@@ -455,7 +455,7 @@
     changegroup. else send one email per changeset.'''
 
     n = notifier(ui, repo, hooktype)
-    ctx = repo[node]
+    ctx = repo.unfiltered()[node]
 
     if not n.subs:
         ui.debug('notify: no subscribers to repository %s\n' % n.root)