diff --git a/ChangeLog b/ChangeLog
index 3e00dd8..ff1469a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,7 @@ ChangeLog
   - Fix not thread-safe of Websocket.close() (#120)
   - Try to get proxy info from environment if not explicitly provided (#124)
   - support proxy basic authenticaiton. (#125)
+  - Fix NoneType exception at WebsocketApp.send (#126)
 
 - 0.21.0
 
diff --git a/websocket/_app.py b/websocket/_app.py
index 0a08c64..999a357 100644
--- a/websocket/_app.py
+++ b/websocket/_app.py
@@ -94,7 +94,7 @@ class WebSocketApp(object):
         opcode: operation code of data. default is OPCODE_TEXT.
         """
 
-        if self.sock.send(data, opcode) == 0:
+        if not self.sock or self.sock.send(data, opcode) == 0:
             raise WebSocketConnectionClosedException()
 
     def close(self):
@@ -108,7 +108,8 @@ class WebSocketApp(object):
     def _send_ping(self, interval, event):
         while not event.wait(interval):
             self.last_ping_tm = time.time()
-            self.sock.ping()
+            if self.sock:
+                self.sock.ping()
 
     def run_forever(self, sockopt=None, sslopt=None, ping_interval=0, ping_timeout=None,
         http_proxy_host=None, http_proxy_port=None):