From 0c4e86dcd101dc9affa988a4be3c2c557f375aad Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 21 Feb 2015 15:12:31 +0530
Subject: [PATCH] ...

---
 src/calibre/db/backend.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/calibre/db/backend.py b/src/calibre/db/backend.py
index c5a4bd5726..0df7e939c8 100644
--- a/src/calibre/db/backend.py
+++ b/src/calibre/db/backend.py
@@ -111,7 +111,10 @@ class DBPrefs(dict):  # {{{
         if not self.disable_setting:
             raw = self.to_raw(val)
             with self.db.conn:
-                dbraw = self.db.execute('SELECT id,val FROM preferences WHERE key=?', (key,)).fetchone()
+                try:
+                    dbraw = self.db.execute('SELECT id,val FROM preferences WHERE key=?', (key,)).next()
+                except StopIteration:
+                    dbraw = None
                 if dbraw is None or dbraw[1] != raw:
                     if dbraw is None:
                         self.db.execute('INSERT INTO preferences (key,val) VALUES (?,?)', (key, raw))