在下载甲醇 MA889.CZCE 2015/1/1 - 2021/1/1 的数据时报出以下错误
Traceback (most recent call last):
File "D:\Work\Anaconda3\lib\site-packages\vnpy_ctabacktester\engine.py", line 404, in run_downloading
data = self.datafeed.query_bar_history(req)
File "D:\Work\Anaconda3\lib\site-packages\vnpy_rqdata\rqdata_datafeed.py", line 179, in query_bar_history
open_price=round_to(row["open"], 0.000001),
File "D:\Work\Anaconda3\lib\site-packages\vnpy\trader\utility.py", line 126, in round_to
rounded = float(int(round(value / target)) * target)
ValueError: cannot convert NaN to integer
