diff -r 4b744c7b35ce -r 317382151ac3 mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Sat Mar 17 15:22:14 2018 +0900
+++ b/mercurial/debugcommands.py	Sat Mar 17 11:23:04 2018 +0900
@@ -2455,7 +2455,7 @@
     if revs is None:
         tres = formatter.templateresources(ui, repo)
         t = formatter.maketemplater(ui, tmpl, resources=tres)
-        ui.write(t.render(props))
+        ui.write(t.renderdefault(props))
     else:
         displayer = logcmdutil.maketemplater(ui, repo, tmpl)
         for r in revs: