From fe03de7471cf2b96c0b89d982f11206bac83848c Mon Sep 17 00:00:00 2001
From: Steven Silvester <steven.silvester@ieee.org>
Date: Wed, 23 Dec 2015 15:55:52 -0600
Subject: [PATCH] Avoid error when using a cross-origin websocket

---
 notebook/base/zmqhandlers.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/notebook/base/zmqhandlers.py b/notebook/base/zmqhandlers.py
index fa0b6f706..542e8ca2a 100644
--- a/notebook/base/zmqhandlers.py
+++ b/notebook/base/zmqhandlers.py
@@ -101,6 +101,7 @@ class WebSocketMixin(object):
     ping_callback = None
     last_ping = 0
     last_pong = 0
+    stream = None
     
     @property
     def ping_interval(self):