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Notebook Error

Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/tornado/web.py", line 1415, in _execute
result = yield result
File "/usr/local/lib/python2.7/dist-packages/tornado/gen.py", line 870, in run
value = future.result()
File "/usr/local/lib/python2.7/dist-packages/tornado/concurrent.py", line 215, in result
raise_exc_info(self._exc_info)
File "/usr/local/lib/python2.7/dist-packages/tornado/gen.py", line 879, in run
yielded = self.gen.send(value)
File "/build/src/notebook/notebook/services/sessions/handlers.py", line 67, in post
model = yield gen.maybe_future(sm.get_session(path=path))
File "/build/src/notebook/notebook/services/sessions/sessionmanager.py", line 170, in get_session
return self.row_to_model(row)
File "/build/src/notebook/notebook/services/sessions/sessionmanager.py", line 209, in row_to_model
raise KeyError
KeyError

The Notebook failed to start for me when I attempted to view it through the 'View Backtest Analysis' button in the old backtester. Haven't been able to replicate it.