当我使用javascript更改标签文本时，为什么querySelectorAll不是函数错误弹出？

Question

I'm trying to change the text of a tag using javascript.

This is my HTML:

<div class="btn_list03 btn_list">
    <a href="javascirpt:void(0);" id="btn_sort">good</a>
</div>

This is my JavaScript:

document.querySelector('#btn_sort').textContent = "comment"
$('#btn_sort').text("comment");

I've tried these code. they change the text well but every single time i change the text i get this error querySelectorAll is not a function.

Error:

Uncaught TypeError: c.querySelectorAll is not a function at MutationObserver.

Should i just ignore that error or Did i make something wrong?

any help would be appreciate thank you.

--edited--

n && c && e.MutationObserver && (o = new e.MutationObserver(function(e) {
                                for (var t = [], n = 0; n < e.length; n += 1) {
                                    var o = e[n];
                                    if ("attributes" === o.type)
                                        t.push(o.target);
                                    else if ("childList" === o.type)
                                        for (var r = o.addedNodes, i = 0; i < r.length; i += 1) {
                                            var c = r[i];
                                            t.push(c);
                                            for (var s = c.querySelectorAll("[id],[class],[href]"), a = 0; a < s.length; a += 1)
                                                t.push(s[a])
                                        }
                                }
                                l(t)
                            }

i found it this error is occurred in external js library and this is where the error is occurred.

Answer 1

It was caused from chrome's Ghostery extension not my js problem.

when i turned it off the error was disappeared.