When empty array or dictionary were passed for data, an uncatched TypeError exception was raised.

socketio/packet.py

@@ -135,8 +135,14 @@ class Packet(object):
         else:
             return data
 
+
+
+
+
+
     def _data_is_binary(self, data):
         """Check if the data contains binary components."""
+        try:
             if isinstance(data, six.binary_type):
                 return True
             elif isinstance(data, list):
@@ -149,3 +155,5 @@ class Packet(object):
                                           for item in six.itervalues(data)])
             else:
                 return False
+        except TypeError:
+            return False