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@wakecarter thank you for suggestions!
Sorry for the late response. I coudn’t have chance to reply earlier.
I try the code that you provided. It works without a problem offline. However, I have the same problems with online experiment.

keys = event.getKeys()
if keys:
    if 't' in keys and keys[0] == corrAns:
        continueRoutine=False 
    elif 't' in keys:
        msg='X'
    elif 'v' in keys and keys[0] == corrAns:
        continueRoutine=False 
    elif 'v' in keys:
        msg='X'
else:
        msg='You need to give faster responses. Please press space to continue'```

I get the following code by Auto → JS and added the first three lines manually.

var msg;
var keys;
event=psychoJS.eventManager //Until here I added manually. 

var _pj;
function _pj_snippets(container) {
    function in_es6(left, right) {
        if (((right instanceof Array) || ((typeof right) === "string"))) {
            return (right.indexOf(left) > (- 1));
        } else {
            if (((right instanceof Map) || (right instanceof Set) || (right instanceof WeakMap) || (right instanceof WeakSet))) {
                return right.has(left);
            } else {
                return (left in right);
            }
        }
    }
    container["in_es6"] = in_es6;
    return container;
}
_pj = {};
_pj_snippets(_pj);
keys = event.getKeys();
if (keys) {
    if ((_pj.in_es6("t", keys) && (keys[0] === corrAns))) {
        continueRoutine = false;
    } else {
        if (_pj.in_es6("t", keys)) {
            msg = "X";
        } else {
            if ((_pj.in_es6("v", keys) && (keys[0] === corrAns))) {
                continueRoutine = false;
            } else {
                if (_pj.in_es6("v", keys)) {
                    msg = "X";
                }
            }
        }
    }
} else {
    msg = "You need to give faster responses. Please press space to continue";
}

I still have the problems that I had earlier;

Thank you so much!
Best wishes,
Emre