Javascript / Toggle / Switch / clearInterval() - not able to clearInterval() when the toggle is switched off

wow, this is my first post! New to programming and coding, this is something of my first projects I work on. I would like to be able to switch a toggle to run a code or to stop it, using the setInterval() for it. But now I am not able to switch it off when selecting the toggle. Tried multiple thing, like break; but not successful so far. Would be great if any of you could point me in the right direction.

Kind regards, Laurens

Code in HTML

<card>
<p>Theft Script ON/OFF</p>
<label class="switch">
<input id="executeTheftScript" type="checkbox" > Toggle me
</label>
</card>

Code in Javascript

function theftToggle(){
    var isChecked = document.getElementById("executeTheftScript").checked;
    if (isChecked) {
        var i = setInterval(function(){
            if (person1.credits === 0) {
                clearInterval(i);
                updateStats();
                console.log("You don't have any credits.");
            } else {
                theft();
                person1.credits--;
                updateStats();
            };
        }, 500);
    } else {
        console.log("Your script is stopped.");
    }
}

document.getElementById("executeTheftScript").addEventListener('click', theftToggle);

Running of the code;

you need addEventListener to the input and it better to set the setInterval variable outside function or make it global so it will not create duplicate setInterval.

var interval;
var person1 = {
  credits: 10
}
 
// listen the input for checked change
document.getElementById("executeTheftScript").addEventListener('change', theftToggle);

function theftToggle() {
  var isChecked = document.getElementById("executeTheftScript").checked;
  if (isChecked) {
    interval = setInterval(function() {
      if (person1.credits === 0) {
        clearInterval(interval);
        updateStats();
        console.log("You don't have any credits.");
      } else {
        theft();
        person1.credits--;
        updateStats();
      }
    }, 500);
  } else {
    clearInterval(interval)
    console.log("Your script is stopped.");
  }
}

function theft() {}

function updateStats() {
  console.log("credits: ", person1.credits);
}

<card>
  <p>Theft Script ON/OFF</p>
  <label class="switch">
    <input id="executeTheftScript" type="checkbox"> Toggle me
  </label>
</card>