--- a/mercurial/debugcommands.py	Thu Mar 14 10:43:01 2019 +0000
+++ b/mercurial/debugcommands.py	Thu Mar 14 09:11:41 2019 +0000
@@ -1488,6 +1488,7 @@
             except error.LookupError as e:
                 raise error.Abort(e, hint="Check your manifest node id")
             manifest.read()  # stores revisision in cache too
+            return
 
     cache = getcache()
     if not len(cache):