# Cannot hide a project configuration: NullReferenceException

**URL:** https://www.finalbuilder.com/forums/t/cannot-hide-a-project-configuration-nullreferenceexception/5899
**Category:** Bugs
**Created:** [March 27, 2014, 2:49am UTC](https://www.finalbuilder.com/forums/t/cannot-hide-a-project-configuration-nullreferenceexception/5899 "2014-03-27T02:49:29Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![jesse10581](https://www.finalbuilder.com/forums/letter_avatar_proxy/v4/letter/j/f17d59/32.png) [@jesse10581](https://www.finalbuilder.com/forums/u/jesse10581)
#### Post date: [March 27, 2014, 2:49am UTC](https://www.finalbuilder.com/forums/t/cannot-hide-a-project-configuration-nullreferenceexception/5899/1 "2014-03-27T02:49:29Z")

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Running version 1.0.0.2985,&nbsp;I get this error whenever trying to hide a configuration:  
  
The web server reported the following error:  
System.NullReferenceException: Object reference not set to an instance of an object.&nbsp;  
at Continua.Web.Builds.Controllers.ProjectsController.SetHiddenConfigs(IEnumerable`1 configIds)&nbsp;

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### Author: ![josephine.hall](https://www.finalbuilder.com/forums/letter_avatar_proxy/v4/letter/j/edb3f5/32.png) [@josephine.hall](https://www.finalbuilder.com/forums/u/josephine.hall)
#### Post date: [March 28, 2014, 2:39am UTC](https://www.finalbuilder.com/forums/t/cannot-hide-a-project-configuration-nullreferenceexception/5899/2 "2014-03-28T02:39:16Z")

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Hi, thanks for reporting this issue. I was able to reproduce the null reference in that part of the code and I’ve made a fix for the problem which will be in the next build we put out. However I was only able to reproduce it once - so it might be worth you trying to show and hide configs again to see if it’s still happening every time.   
 I’ll let you know when the build is available and we can see if that resolves the issue.