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分データを含むCSVファイルでninjaTraderフィードを使用しようとしています。 プログラムは、エラーを吐く、7つのonBarsコールに意図したとおりに動作します：7回のonBars（）コールの後にPyalgotradeのninjatraderfeedが失敗する
self.info(str(instr) + " current Open price: %.2f" % (bars.getBar(instr).getOpen())) AttributeError: 'NoneType' object has no attribute 'getOpen'
マイコード：
class myExample(strategy.BacktestingStrategy):
def __init__(self, feed, instruments):
self.__position = None
strategy.BacktestingStrategy.__init__(self, feed, 10000)
self.__instruments = instruments
def onBars(self, bars):
for instr in self.__instruments:
self.info(str(instr) + " current Open price: %.2f" % (bars.getBar(instr).getOpen()))
feed = ninjatraderfeed.Feed(Frequency.MINUTE)
feed.addBarsFromCSV("AMZN", "AMZN.csv")
feed.addBarsFromCSV("MMM", "MMM.csv")
strat = myExample(feed, ["AMZN","MMM"])
strat.run()
AMZN.csv
20161227 093100 761.8262 763.77 761.58 763.4 11629
20161227 093200 762.12 762.48 761.2 761.85 15101
20161227 093300 762.215 762.769 761.77 761.77 13181
20161227 093400 762.3516 762.62 762.066 762.2211 6483
20161227 093500 762.73 762.88 762.2 762.392 8093
20161227 093600 763.055 763.36 762.7318 762.7318 11446
20161227 093700 762.45 763.4595 762.45 763.17 8561
20161227 093800 762.8 763 762.45 762.75 10116
MMM.csv
20161227 093100 178.95 178.95 178.775 178.775 200
20161227 093200 178.58 178.75 178.57 178.73 15968
20161227 093300 178.9 178.935 178.765 178.765 604
20161227 093400 179.12 179.14 178.91 178.91 2517
20161227 093500 178.8167 179.15 178.8167 179.12 4236
20161227 093600 178.74 178.92 178.74 178.918 2900
20161227 093800 178.78 178.78 178.78 178.78 100
20161227 093900 178.95 178.99 178.9 178.9 1300
出力：
2016-12-27 09:31:00+00:00 strategy [INFO] AMZN current Open price: 761.83
2016-12-27 09:31:00+00:00 strategy [INFO] MMM current Open price: 178.95
2016-12-27 09:32:00+00:00 strategy [INFO] AMZN current Open price: 762.12
2016-12-27 09:32:00+00:00 strategy [INFO] MMM current Open price: 178.58
2016-12-27 09:33:00+00:00 strategy [INFO] AMZN current Open price: 762.22
2016-12-27 09:33:00+00:00 strategy [INFO] MMM current Open price: 178.90
2016-12-27 09:34:00+00:00 strategy [INFO] AMZN current Open price: 762.35
2016-12-27 09:34:00+00:00 strategy [INFO] MMM current Open price: 179.12
2016-12-27 09:35:00+00:00 strategy [INFO] AMZN current Open price: 762.73
2016-12-27 09:35:00+00:00 strategy [INFO] MMM current Open price: 178.82
2016-12-27 09:36:00+00:00 strategy [INFO] AMZN current Open price: 763.05
2016-12-27 09:36:00+00:00 strategy [INFO] MMM current Open price: 178.74
2016-12-27 09:37:00+00:00 strategy [INFO] AMZN current Open price: 762.45
Traceback (most recent call last):
File "example.py", line 43, in <module>
strat.run()
File "/home/work/pyCharmZipEnv/local/lib/python2.7/site-packages/pyalgotrade/strategy/__init__.py", line 512, in run
self.__dispatcher.run()
File "/home/work/pyCharmZipEnv/local/lib/python2.7/site-packages/pyalgotrade/dispatcher.py", line 109, in run
eof, eventsDispatched = self.__dispatch()
File "/home/work/pyCharmZipEnv/local/lib/python2.7/site-packages/pyalgotrade/dispatcher.py", line 97, in __dispatch
if self.__dispatchSubject(subject, smallestDateTime):
File "/home/work/pyCharmZipEnv/local/lib/python2.7/site-packages/pyalgotrade/dispatcher.py", line 75, in __dispatchSubject
ret = subject.dispatch() is True
File "/home/work/pyCharmZipEnv/local/lib/python2.7/site-packages/pyalgotrade/feed/__init__.py", line 108, in dispatch
self.__event.emit(dateTime, values)
File "/home/work/pyCharmZipEnv/local/lib/python2.7/site-packages/pyalgotrade/observer.py", line 61, in emit
handler(*args, **kwargs)
File "/home/work/pyCharmZipEnv/local/lib/python2.7/site-packages/pyalgotrade/strategy/__init__.py", line 505, in __onBars
self.onBars(bars)
File "example.py", line 30, in onBars
self.info(str(instr) + " current Open price: %.2f" % (bars.getBar(instr).getOpen()))
AttributeError: 'NoneType' object has no attribute 'getOpen
ninjatraderfeed.pyで変更したのは、 ";"の代わりに "、"を使用するgetDelimiter（）でした。
7回のonBarsコールの後に動作が停止するのはなぜですか？
EDIT：各csvファイルから最初の8つの値をコピーしました。