Stacktrace not printed

I face the same issue as the user here (please look at his answer, the More detailed story
https://stackoverflow.com/questions/66463611/paho-mqtt-js-client-loses-connection-to-mosquitto-broker-when-i-publish-or-recei

in line 1255 and in line 1444 it is
var errorStack = ((error.hasOwnProperty("stack") == "undefined") ? error.stack.toString() : "No Error Stack Available");
so when it faces an error, it prints No Error Stack Available instead of giving the stack. From what the stackoverflow user says and seems logical, it should be reversed.
Could this be fixed?