limit_price 参数不支持设置为 nan，是怎么回事

Traceback (most recent call last):
File “E:\python38\mnqq.py”, line 90, in <module>
ordec = api.insert_order(symbol=symboc, direction=”BUY”, offset=”CLOSE”, volume=1, limit_price = quote.bid_price1 + 1 )
File “E:\python38\lib\site-packages\tqsdk\api.py”, line 1248, in insert_order
raise Exception(f”limit_price 参数不支持设置为 {limit_price}。”)
Exception: limit_price 参数不支持设置为 nan。