From 2099128e759fa04d6e0bcdb2dfc3d2756ebc3337 Mon Sep 17 00:00:00 2001
From: Antoine Nguyen <tonio@ngyn.org>
Date: Wed, 24 Sep 2014 12:11:04 +0200
Subject: [PATCH] Prevent KeyError exception.

see #585
---
 modoboa/lib/webutils.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/modoboa/lib/webutils.py b/modoboa/lib/webutils.py
index 20bdcebb6..71fe27e51 100644
--- a/modoboa/lib/webutils.py
+++ b/modoboa/lib/webutils.py
@@ -176,8 +176,9 @@ class NavigationParameters(object):
                            ('criteria', 'from_addr', False)]
 
     def __getitem__(self, key):
-        """
-        """
+        """Retrieve an item."""
+        if self.sessionkey not in self.request.session:
+            return None
         return self.request.session[self.sessionkey][key]
 
     def __contains__(self, key):