# Error after upgrade to 7.3.3

**URL:** <https://forum.litium.com/t/error-after-upgrade-to-7-3-3/1397>\
**Category:** Questions\
**Tags:** litium-7\
**Created:** [March 23, 2020, 7:29am UTC](https://forum.litium.com/t/error-after-upgrade-to-7-3-3/1397 "2020-03-23T07:29:44Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![abergman](https://avatars.discourse-cdn.com/v4/letter/a/3da27b/32.png) [@abergman](https://forum.litium.com/u/abergman)\
**Post date:** [March 23, 2020, 7:29am UTC](https://forum.litium.com/t/error-after-upgrade-to-7-3-3/1397/1 "2020-03-23T07:29:44Z")

</div>

After upgrade to 7.3.3 we see this error in log every 5th second:

```
2020-03-21 21:14:24.5637 [App:02] [c355ad01-1cb4-433e-b1cd-a62833fa97da] [ERROR] [] Litium.Application.Scheduler.BackgroundJobEngine - Execution of background processor Litium.Application.Scheduler.BackgroundJobWorker, Litium.Application failed, executing again in 5 seconds. System.NullReferenceException: Object reference not set to an instance of an object.
   at Litium.Application.Scheduler.BackgroundJobQueue.<ReceiveAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Litium.Application.Scheduler.BackgroundJobWorker.<ExecuteAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Litium.Application.Scheduler.BackgroundJobEngine.InfiniteRetryBackgroundProcess.<ExecuteAsync>d__3.MoveNext()

```

Any idea why we are getting this error?

Litium version: 7.3.3-patch-2003180843

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<div class="post-metadata">

**Author:** ![patric.forsgard](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/patric.forsgard/32/10_2.png) [@patric.forsgard](https://forum.litium.com/u/patric.forsgard)\
**Post date:** [March 24, 2020, 8:11am UTC](https://forum.litium.com/t/error-after-upgrade-to-7-3-3/1397/2 "2020-03-24T08:11:37Z")

</div>

Please, see [https://docs.litium.com/support/bugs/bug\_details?id=49525](https://docs.litium.com/support/bugs/bug_details?id=49525)

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<div class="post-metadata">

**Author:** ![abergman](https://avatars.discourse-cdn.com/v4/letter/a/3da27b/32.png) [@abergman](https://forum.litium.com/u/abergman)\
**Post date:** [March 24, 2020, 8:43am UTC](https://forum.litium.com/t/error-after-upgrade-to-7-3-3/1397/3 "2020-03-24T08:43:46Z")

</div>

Ok, thanks. Will the error affect the “new” application?

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<div class="post-metadata">

**Author:** ![patric.forsgard](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/patric.forsgard/32/10_2.png) [@patric.forsgard](https://forum.litium.com/u/patric.forsgard)\
**Post date:** [March 24, 2020, 9:19am UTC](https://forum.litium.com/t/error-after-upgrade-to-7-3-3/1397/4 "2020-03-24T09:19:57Z")

</div>

The error will not affect the new application, only the old one. In this case when we talk about app domain starts in the application pool.

If we check the log we have rows that starts in this way

```auto
2020-03-24 10:06:15.9354 [App:04] [b6581d4c-7c72-48b3-b751-fa5ef939dada] [INFO]

```

where the `[App:04]` tells that is the 3 times the app domain have started (first add domain always get `App:02` as name) and then the number is increment for each start and all log-rows that have the same app-number will be in the same context, if they are in different app they are executed independent of each other and is not related.

I have publish a new version of the pre-release that will (finger crossed) handle this in a graceful way without logging the error.

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<div class="post-metadata">

**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/litium/original/1X/12eddac3b8b661de1db86af10ac8151b571e6fb9.png) [@system](https://forum.litium.com/u/system)\
**Post date:** [April 21, 2020, 9:20am UTC](https://forum.litium.com/t/error-after-upgrade-to-7-3-3/1397/5 "2020-04-21T09:20:05Z")

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