diff -r ff0060d2a099 -r 536f22d6c2c5 mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py	Sun Sep 23 17:01:26 2018 +0900
+++ b/mercurial/hgweb/hgwebdir_mod.py	Sun Sep 23 16:15:48 2018 +0900
@@ -383,8 +383,7 @@
                     fname = virtual[7:]
                 else:
                     fname = req.qsparams['static']
-                static = self.ui.config("web", "static", None,
-                                        untrusted=False)
+                static = self.ui.config("web", "static", untrusted=False)
                 if not static:
                     tp = self.templatepath or templater.templatepaths()
                     if isinstance(tp, str):