# Post with embedded latex makes channel unusable

**URL:** <https://forum.mattermost.com/t/post-with-embedded-latex-makes-channel-unusable/4760>\
**Category:** Troubleshooting\
**Created:** [April 10, 2018, 11:27pm UTC](https://forum.mattermost.com/t/post-with-embedded-latex-makes-channel-unusable/4760 "2018-04-10T23:27:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gubbins](https://avatars.discourse-cdn.com/v4/letter/g/cab0a1/32.png) [@gubbins](https://forum.mattermost.com/u/gubbins)\
**Post date:** [April 10, 2018, 11:27pm UTC](https://forum.mattermost.com/t/post-with-embedded-latex-makes-channel-unusable/4760/1 "2018-04-10T23:27:38Z")

</div>

#### Summary

A specific post in a direct chat caused the direct chat channel to be unusable until the post was deleted in the database.

#### Steps to reproduce

Using mattermost 4.7.2.  
Post the following to a channel:

````
this:
```latex
		\begin{eqnarray*}
			\Delta\sigma_{R} = \sigma_T - \sigma_I)
		\end{eqnarray*}
```

````

#### Expected behavior

Channel does not break

#### Observed behavior

All users in that channel saw a blank screen every time they navigated to the channel (whether using the browser or a desktop client). They had to re-open the client/browser to navigate to another channel.

After deleting this post, normal behaviour returned.

---

<div class="post-metadata">

**Author:** ![paulrothrock](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/paulrothrock/32/2967_2.png) [@paulrothrock](https://forum.mattermost.com/u/paulrothrock)\
**Post date:** [April 12, 2018, 3:11pm UTC](https://forum.mattermost.com/t/post-with-embedded-latex-makes-channel-unusable/4760/2 "2018-04-12T15:11:37Z")

</div>

Thanks for reaching out. [This is a known issue in version 4.7.2](https://mattermost.atlassian.net/browse/MM-9718?jql=text%20~%20%22latex%22) and we released a fix for it in version 4.8 so if you upgrade that should fix it.

---

<div class="post-metadata">

**Author:** ![gubbins](https://avatars.discourse-cdn.com/v4/letter/g/cab0a1/32.png) [@gubbins](https://forum.mattermost.com/u/gubbins)\
**Post date:** [April 13, 2018, 1:43am UTC](https://forum.mattermost.com/t/post-with-embedded-latex-makes-channel-unusable/4760/3 "2018-04-13T01:43:21Z")

</div>

I don’t seem to have permission to view that ticket, but thanks - will test it after next upgrade!