From 1bbc915ac0b0ff6b24d7655c9d48dfdd3392ffd0 Mon Sep 17 00:00:00 2001
From: Sylvain Corlay <sylvain.corlay@gmail.com>
Date: Wed, 30 Jul 2014 23:16:24 -0400
Subject: [PATCH] setting _comm to None

---
 IPython/html/widgets/widget.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/IPython/html/widgets/widget.py b/IPython/html/widgets/widget.py
index 3a72d0de1..745e7d60f 100644
--- a/IPython/html/widgets/widget.py
+++ b/IPython/html/widgets/widget.py
@@ -167,6 +167,7 @@ class Widget(LoggingConfigurable):
         del Widget.widgets[self.model_id]
         if self._comm is not None:
             self._comm.close()
+        self._comm = None
     
     def send_state(self, key=None):
         """Sends the widget state, or a piece of it, to the front-end.