qlib运行中出现以下警告怎么解决？[14490:MainThread](2024-09-20 13:27:18,399) WARNING - qlib.online operator - [exchange.py:219] - $close field data contains nan.或者怎么填充nan

[wzcxyz386]

[14490:MainThread](2024-09-20 13:27:06,572) INFO - qlib.backtest caller - [init.py:93] - Create new exchange
[14490:MainThread](2024-09-20 13:27:18,399) WARNING - qlib.online operator - [exchange.py:219] - $close field data contains nan.
[14490:MainThread](2024-09-20 13:27:18,400) WARNING - qlib.online operator - [exchange.py:219] - $close field data contains nan.

[chester1uo]

I meet same problem, it is disaster if I want to use downloaded data in recent years, full with bugs when process data!