diff -r 4b744c7b35ce -r 317382151ac3 mercurial/logcmdutil.py
--- a/mercurial/logcmdutil.py	Sat Mar 17 15:22:14 2018 +0900
+++ b/mercurial/logcmdutil.py	Sat Mar 17 11:23:04 2018 +0900
@@ -285,7 +285,7 @@
         t = formatter.maketemplater(self.repo.ui, '{join(obsfate, "\n")}',
                                     defaults=templatekw.keywords,
                                     resources=tres)
-        obsfate = t.render({'ctx': ctx, 'revcache': {}}).splitlines()
+        obsfate = t.renderdefault({'ctx': ctx, 'revcache': {}}).splitlines()
 
         if obsfate:
             for obsfateline in obsfate:
@@ -858,7 +858,7 @@
                                     resources=tres)
     def formatnode(repo, ctx):
         props = {'ctx': ctx, 'repo': repo, 'revcache': {}}
-        return templ.render(props)
+        return templ.renderdefault(props)
     return formatnode
 
 def displaygraph(ui, repo, dag, displayer, edgefn, getrenamed=None, props=None):