From cd408d9c96df8c9b99203e6964dff76a3c1217af Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 18 Mar 2017 08:43:07 +0530
Subject: [PATCH] Fix a typo that caused dynamically updated metadata source
 plugins to stop working. Fixes #1673884 [Amazon Metadata Plugin Not Used When
 "metadata-sources-cache.json"
 Exists](https://bugs.launchpad.net/calibre/+bug/1673884)

---
 src/calibre/customize/ui.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/customize/ui.py b/src/calibre/customize/ui.py
index f8e4f17c07..72b7202b50 100644
--- a/src/calibre/customize/ui.py
+++ b/src/calibre/customize/ui.py
@@ -624,7 +624,7 @@ def patch_metadata_plugins(possibly_updated_plugins):
             pup = possibly_updated_plugins.get(plugin.name)
             if pup is not None:
                 if pup.version > plugin.version and pup.minimum_calibre_version <= numeric_version:
-                    patches[i] = pup
+                    patches[i] = pup(None)
     for i, pup in patches.iteritems():
         _initialized_plugins[i] = pup
 # }}}