data.history() fails tracing back to alpaca_trade_api/rest.py TypeError

Reproduceable by calling `data.history(symbol('SSY'), 'price', bar_count=745, frequency="1m").fillna('ffill') `.

With some symbols the function will run with expected results. Other times the following error will occur with certain symbols. It traces back to a TypeError, despite no argument changes when data is successfully gotten from a symbol.

`Exception in thread Thread-904:Traceback (most recent call last): File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner self.run() File "/usr/lib/python3.6/threading.py", line 864, in run self._target(*self._args, **self._kwargs) File "/usr/lib/python3.6/multiprocessing/pool.py", line 463, in _handle_results task = get() File "/usr/lib/python3.6/multiprocessing/connection.py", line 251, in recv return _ForkingPickler.loads(buf.getbuffer()) File "/home/vincentfperkins/venv/lib/python3.6/site-packages/alpaca_trade_api/rest.py", line 48, in __init__ super().__init__(error['message'])TypeError: string indices must be integers`

Any help is much appreciated. Thank you.