# Cannot read property 'appendChild' of undefined at mtc.js:1

**URL:** <https://forum.mautic.org/t/cannot-read-property-appendchild-of-undefined-at-mtc-js-1/9065>\
**Category:** Product Support\
**Created:** [July 26, 2017, 5:55am UTC](https://forum.mautic.org/t/cannot-read-property-appendchild-of-undefined-at-mtc-js-1/9065 "2017-07-26T05:55:04Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![denispavliha](https://avatars.discourse-cdn.com/v4/letter/d/e0b2c6/32.png) [@denispavliha](https://forum.mautic.org/u/denispavliha)\
**Post date:** [July 26, 2017, 5:55am UTC](https://forum.mautic.org/t/cannot-read-property-appendchild-of-undefined-at-mtc-js-1/9065/1 "2017-07-26T05:55:04Z")

</div>

Anyone has been getting this in the browser console for some time now? This is an external page with Mautic script included. It worked flawlessly before.

Code:

Cannot read property 'appendChild' of undefined at mtc.js:1

  
Best,  
D.

---

<div class="post-metadata">

**Author:** ![denispavliha](https://avatars.discourse-cdn.com/v4/letter/d/e0b2c6/32.png) [@denispavliha](https://forum.mautic.org/u/denispavliha)\
**Post date:** [July 26, 2017, 5:55am UTC](https://forum.mautic.org/t/cannot-read-property-appendchild-of-undefined-at-mtc-js-1/9065/2 "2017-07-26T05:55:04Z")

</div>

Anyone has been getting this in the browser console for some time now? This is an external page with Mautic script included. It worked flawlessly before.

```auto
Cannot read property 'appendChild' of undefined at mtc.js:1
```

Best,  
D.