# Topic Cannot read properties of null (reading 'map')

**URL:** https://discuss.gnomad.broadinstitute.org/t/topic-cannot-read-properties-of-null-reading-map/157
**Category:** Browser
**Tags:** bug
**Created:** [February 2, 2024, 4:20pm UTC](https://discuss.gnomad.broadinstitute.org/t/topic-cannot-read-properties-of-null-reading-map/157 "2024-02-02T16:20:04Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![epinto](https://avatars.discourse-cdn.com/v4/letter/e/f4b2a3/32.png) [@epinto](https://discuss.gnomad.broadinstitute.org/u/epinto)
#### Post date: [February 2, 2024, 4:20pm UTC](https://discuss.gnomad.broadinstitute.org/t/topic-cannot-read-properties-of-null-reading-map/157/1 "2024-02-02T16:20:04Z")

</div>

**Description** :

**Error message** : Cannot read properties of null (reading ‘map’)

**Stack trace** :

```auto
TypeError: Cannot read properties of null (reading 'map')
    at T (https://gnomad.broadinstitute.org/js/507-64cb7d9b695f7f5238cd.js:71:7278)
    at aa (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:178930)
    at $u (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:231023)
    at Il (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:218302)
    at Cl (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:218230)
    at Ol (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:218093)
    at vl (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:215080)
    at https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:164852
    at t.unstable_runWithPriority (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:319258)
    at $o (https://gnomad.broadinstitute.org/js/bundle-74db46f6dce4bd51644a.js:39:164629)

```

**Route** : /variant/DEL\_CHR11\_1BD62678?dataset=gnomad\_sv\_r4

**Browser** : Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 Edg/121.0.0.0

---

<div class="post-metadata">

### Author: ![steve](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.gnomad.broadinstitute.org/steve/32/10_2.png) [@steve](https://discuss.gnomad.broadinstitute.org/u/steve)
#### Post date: [February 2, 2024, 4:23pm UTC](https://discuss.gnomad.broadinstitute.org/t/topic-cannot-read-properties-of-null-reading-map/157/2 "2024-02-02T16:23:07Z")

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Welcome @epinto , and thanks for letting us know!

We’ve received a few reports of this issue, and we’re looking into it. You can track the status over at [GitHub - gnomad-browser Issue #1380](https://github.com/broadinstitute/gnomad-browser/issues/1380).