mercurial/logcmdutil.py

--- a/mercurial/logcmdutil.py	Tue Oct 16 04:59:36 2018 -0700
+++ b/mercurial/logcmdutil.py	Tue May 14 09:13:39 2019 -0700
@@ -743,7 +743,7 @@
             return match
 
     expr = _makerevset(repo, match, pats, slowpath, opts)
-    if opts.get('graph') and opts.get('rev'):
+    if opts.get('graph'):
         # User-specified revs might be unsorted, but don't sort before
         # _makerevset because it might depend on the order of revs
         if not (revs.isdescending() or revs.istopo()):