When I receive data from the websocket that has a null result, the program crashes.
In the attached test case, if you comment out the line that sends the subscribe request the program doesn't crash. This is because the message that is sent back includes a null result. However the websocket library should be able to handle this.
Here's the output from a Chrome websocket extension that does the same thing. The result from the subscribe request is null, but the websocket loop continues to function as expected.
{"e":"kline","E":1660633181407,"s":"BNBUSDT","k":{"t":1660633140000,"T":1660633199999,"s":"BNBUSDT","i":"1m","f":578704188,"L":578704249,"o":"317.00000000","c":"316.90000000","h":"317.10000000","l":"316.80000000","v":"111.62500000","n":62,"x":false,"q":"35378.63340000","V":"12.78200000","Q":"4052.67600000","B":"0"}}
{"e":"kline","E":1660633188428,"s":"BNBUSDT","k":{"t":1660633140000,"T":1660633199999,"s":"BNBUSDT","i":"1m","f":578704188,"L":578704250,"o":"317.00000000","c":"316.90000000","h":"317.10000000","l":"316.80000000","v":"111.65900000","n":63,"x":false,"q":"35389.40800000","V":"12.81600000","Q":"4063.45060000","B":"0"}}
{ "method": "SUBSCRIBE", "params": [ "adausdt@kline_1m" ], "id": 1 }
{"result":null,"id":1}
{"e":"kline","E":1660633189014,"s":"ADAUSDT","k":{"t":1660633140000,"T":1660633199999,"s":"ADAUSDT","i":"1m","f":403020801,"L":403020878,"o":"0.55370000","c":"0.55320000","h":"0.55370000","l":"0.55310000","v":"39277.50000000","n":78,"x":false,"q":"21734.35789000","V":"14835.80000000","Q":"8208.74871000","B":"0"}}
{"e":"kline","E":1660633190748,"s":"BNBUSDT","k":{"t":1660633140000,"T":1660633199999,"s":"BNBUSDT","i":"1m","f":578704188,"L":578704251,"o":"317.00000000","c":"316.80000000","h":"317.10000000","l":"316.80000000","v":"111.75900000","n":64,"x":false,"q":"35421.08800000","V":"12.81600000","Q":"4063.45060000","B":"0"}}