From 99701c947e4cf969c5c7a226cdfd56eaf4f0e0d4 Mon Sep 17 00:00:00 2001
From: Lance Stout <lancestout@gmail.com>
Date: Mon, 9 Jul 2012 22:59:26 -0700
Subject: [PATCH] Prevent None from being added to the schedule from a timing
 issue.

---
 sleekxmpp/xmlstream/scheduler.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sleekxmpp/xmlstream/scheduler.py b/sleekxmpp/xmlstream/scheduler.py
index 70e36f24..f68af081 100644
--- a/sleekxmpp/xmlstream/scheduler.py
+++ b/sleekxmpp/xmlstream/scheduler.py
@@ -172,7 +172,8 @@ class Scheduler(object):
                 else:
                     updated = True
                     self.schedule_lock.acquire()
-                    self.schedule.append(newtask)
+                    if newtask is not None:
+                        self.schedule.append(newtask)
                 finally:
                     if updated:
                         self.schedule = sorted(self.schedule,