Problem using isNaN()

General
9

I'm reading data from a csv file.

ScreenShot_20230701181659

and this is a message example from the CSV convertor

{"filename":"C:\\Users\\dhami\\Desktop\\pktlog_AA555A0000000101_20230623T162117Z.csv",
"payload":{
"col1":"AA555A0000000101",
"col3":"2023-06-23 16:58:11.202Z",
"col4":1522195652,
"col5":868300000,
"col6":1,"col7":1,
"col8":"CRC_BAD",
"col9":21,
"col10":"LORA",
"col11":125000,
"col12":"SF12  ",
"col13":"05-Apr",
"col14":-21,
"col15":8,
"col16":"C046DA0B-33891A03-1507FE33-AD04F717-59E138C8-B3"},
"parts":{"index":126,"ch":"\n","type":"string","id":"d9ec479b5f811bbb","count":null},
"_msgid":"3157f6e045e3a6b6",
"columns":"col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16"}