--- a/mercurial/localrepo.py	Mon Jul 13 13:06:12 2020 -0400
+++ b/mercurial/localrepo.py	Fri Jul 10 00:44:18 2020 +0200
@@ -2996,7 +2996,7 @@
 
             # internal config: ui.allowemptycommit
             allowemptycommit = (
-                wctx.branch() != wctx.p1().branch()
+                cctx.branch() != cctx.p1().branch()
                 or extra.get(b'close')
                 or merge
                 or cctx.files()