2013-05-20 12:48:48,034 Exception in callback <functools.partial object at 0x8090f7998>
Traceback (most recent call last):
  File "/usr/local/noc/lib/python2.7/site-packages/tornado/ioloop.py", line 453, in _run_callback
    callback()
  File "/usr/local/noc/lib/python2.7/site-packages/tornado/stack_context.py", line 241, in wrapped
    callback(*args, **kwargs)
  File "/usr/local/noc/lib/python2.7/site-packages/tornado/iostream.py", line 316, in wrapper
    callback(*args)
  File "/usr/local/noc/lib/python2.7/site-packages/tornado/stack_context.py", line 241, in wrapped
    callback(*args, **kwargs)
  File "/usr/local/noc/lib/python2.7/site-packages/tornado/httpserver.py", line 217, in _on_connection_close
    callback()
TypeError: 'NoneType' object is not callable