From 4b9dcf377c4b8abc81afb10fdde9b0d918068000 Mon Sep 17 00:00:00 2001
From: Calum Lind <calumlind+deluge@gmail.com>
Date: Wed, 7 Oct 2015 00:18:40 +0100
Subject: [PATCH] [Core] Fix Twisted AlreadyCalled error on shutdown

---
 deluge/core/alertmanager.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/deluge/core/alertmanager.py b/deluge/core/alertmanager.py
index 6f6f40371..7c65abfff 100644
--- a/deluge/core/alertmanager.py
+++ b/deluge/core/alertmanager.py
@@ -74,7 +74,8 @@ class AlertManager(component.Component):
 
     def stop(self):
         for dc in self.delayed_calls:
-            dc.cancel()
+            if dc.active():
+                dc.cancel()
         self.delayed_calls = []
 
     def register_handler(self, alert_type, handler):