TypeError无法读取未定义的属性“ currenttarget”

Question

运行下面提到的代码时，出现错误消息：“ TypeError：无法读取未定义的属性'currentTarget'。”

是因为我的currentTarget提到了2个地方吗？

仅运行1个函数“ deleteFood”时，它不会给出任何错误。

<script>
let cB = document.getElementsByClassName("deleteFoodClass");
var anyBoxesUnchecked = [];
for (i = 0; i < cB.length; i++) {
    cB[i].addEventListener('click', checkBoxMarked);
}

function checkBoxMarked(arg) {
    var trueBoolean = "true";
    let elm = arg.currentTarget;
    let marked = elm.getAttribute('data-IngredientMarked');
    let id = elm.getAttribute('data-ingredientID');

    if(marked === true){
        anyBoxesUnchecked.push(id);      // ... and adding them to the array.
    } else
        anyBoxesUnchecked.splice(id);
}

function deleteFood(arg) {
    let el = arg.currentTarget;
    let id = el.getAttribute('data-ingredientID');

    console.log(id); // used for debugging

    var url = '/api/Ingredients/';
    var urlQuery = url.concat(id);
    for (i = 0; i < anyBoxesUnchecked.length; i++) {
    fetch(urlQuery,
        {
            method: 'GET',
            body: undefined,
            headers: {
                "Content-type": "application/json; charset=UTF-8"
            }
        })
        //.then(res => res.json())
        .catch(error => console.error('Error', error))
        .then(response => console.log('Sucess On Deletion', response));
    }
}

</script>

已编辑：尝试调试时会出现以下错误： Picture of debug message

解决方案：发现-由于某种原因，鉴于从未调用过checkBoxMarked-我试图用“ function（）”替换它，从而解决了问题。