# Custom Header Links (icons)

**URL:** https://meta.discourse.org/t/custom-header-links-icons/86307
**Category:** Theme component
**Tags:** official, custom-header-icons
**Created:** [April 27, 2018, 2:00pm UTC](https://meta.discourse.org/t/custom-header-links-icons/86307 "2018-04-27T14:00:38Z")
**Posts on this page:** 1
**Showing post:** 129

<div class="post-metadata">

### Author: ![Jonathan5](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jonathan5/32/197134_2.png) [@Jonathan5](https://meta.discourse.org/u/Jonathan5)
#### Post date: [May 20, 2021, 11:01pm UTC](https://meta.discourse.org/t/custom-header-links-icons/86307/129 "2021-05-20T23:01:09Z")

</div>

I’ve upgraded this and see the following error message on the `/admin/customize/themes` page:

```plaintext
Error: Undefined variable: "$add-whitespace". on line 14 of common.scss >> @if $add_whitespace == "true" { ----^

```

Update: I ticked the new “whitespace” box and unticked it (saving each time) and the error has disappeared.

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