IndexError: array index out of range

[shixin-code]

Traceback (most recent call last):
File "e:\code\python\backtrader\btmain_ib.py", line 58, in
results = cerebro.run()
^^^^^^^^^^^^^
File "C:\Users\shixi\miniconda3\envs\backtrader\Lib\site-packages\backtrader\cerebro.py", line 1132, in run
runstrat = self.runstrategies(iterstrat)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\shixi\miniconda3\envs\backtrader\Lib\site-packages\backtrader\cerebro.py", line 1303, in runstrategies
self._runnext(runstrats)
File "C:\Users\shixi\miniconda3\envs\backtrader\Lib\site-packages\backtrader\cerebro.py", line 1536, in _runnext
self._datanotify()
File "C:\Users\shixi\miniconda3\envs\backtrader\Lib\site-packages\backtrader\cerebro.py", line 732, in _datanotify
strat.notify_data(data, status, *args, **kwargs)
File "e:\code\python\backtrader\strategies\emastrategy.py", line 43, in notify_data
self.log(f'status {data._getstatusname(status)}')
File "e:\code\python\backtrader\strategies\basestrategy.py", line 33, in log
dt = dt or self.data.datetime[0]
~~~~~~~~~~~~~~~~~~^^^
File "C:\Users\shixi\miniconda3\envs\backtrader\Lib\site-packages\backtrader\linebuffer.py", line 163, in getitem
return self.array[self.idx + ago]
~~~~~~~~~~^^^^^^^^^^^^^^^^
IndexError: array index out of range

[shixin-code]

code like this

clientId = int(datetime.datetime.now().timestamp())
print(f'clientId: {clientId}') 
ibstore = IBStore(host='127.0.0.1', 
                  port=7497, 
                  clientId=clientId)
data = ibstore.getdata(
              name='AAPL', dataname='AAPL',
              secType='STK', currency='USD', exchange='SMART',
            #   backfill_start=False, backfill=False,
              # fromdate = datetime.datetime(2016, 1, 1),
              # todate = datetime.datetime(2018, 1, 1),
              # historical=True,
              # what='TRADES',
              # timeframe=bt.TimeFrame.Ticks,
              # rtbar=False, 
              _debug=True
              )
cerebro.adddata(data)

broker = ibstore.getbroker()
cerebro.setbroker(broker)

cerebro.addstrategy(mystrategy.MyStrategy, printlog=True)

print('Starting Portfolio Value: %.2f' % cerebro.broker.getvalue())
results = cerebro.run()
print('Final Portfolio Value: %.2f' % cerebro.broker.getvalue())