# Program Error: Cannot read properties of null (reading '\_width')

**URL:** https://forum.makecode.com/t/program-error-cannot-read-properties-of-null-reading-width/17394
**Category:** Help
**Created:** [January 12, 2023, 6:12pm UTC](https://forum.makecode.com/t/program-error-cannot-read-properties-of-null-reading-width/17394 "2023-01-12T18:12:12Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Esben](https://avatars.discourse-cdn.com/v4/letter/e/e47c2d/32.png) [@Esben](https://forum.makecode.com/u/Esben)
#### Post date: [January 12, 2023, 6:12pm UTC](https://forum.makecode.com/t/program-error-cannot-read-properties-of-null-reading-width/17394/1 "2023-01-12T18:12:12Z")

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Ever since i got an extension it has broken my game with this text Program Error: Cannot read properties of null (reading ‘\_width’) and idk how to remove an extension but i hope i havent lost my game [https://makecode.com/\_5kYgs5XahLgM](https://makecode.com/_5kYgs5XahLgM)

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### Author: ![AlexK](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/alexk/32/33339_2.png) [@AlexK](https://forum.makecode.com/u/AlexK)
#### Post date: [January 12, 2023, 11:54pm UTC](https://forum.makecode.com/t/program-error-cannot-read-properties-of-null-reading-width/17394/2 "2023-01-12T23:54:07Z")

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Hi, @Esben !

Interesting problem. I removed the 3D Shooting extension from your project, and it seems to be working (or, at least, able to compile and run) now.

> **[Poul](https://arcade.makecode.com/70452-52636-27719-13094)**
>
> Made with ❤️ in Microsoft MakeCode Arcade.

I don’t think there is a way to remove an extension from your project when you are in Blocks mode. I removed the extension by switching into the JavaScript editor. Be careful if you choose to do so! You definitely should make a backup of your project before switching editors.