just in case the stream has been terminated and cleaned up in a different thread already (should fix Lawouach#78)

Lawouach · Lawouach · commit d60c3acdd93d · 2013-02-19T20:21:29.000+01:00
diff --git a/ws4py/websocket.py b/ws4py/websocket.py
@@ -365,8 +365,9 @@ def process(self, bytes):
 
         if s.has_message:
             self.received_message(s.message)
-            s.message.data = None
-            s.message = None
+            if s.message is not None:
+                s.message.data = None
+                s.message = None
             s = None
             return True
 
