# Ignition 8.0.2-rc1 - Unexpected error executing expression/db tag

**URL:** <https://forum.inductiveautomation.com/t/ignition-8-0-2-rc1-unexpected-error-executing-expression-db-tag/25397>\
**Category:** Ignition Early Access\
**Tags:** ignition80\
**Created:** [May 29, 2019, 1:26pm UTC](https://forum.inductiveautomation.com/t/ignition-8-0-2-rc1-unexpected-error-executing-expression-db-tag/25397 "2019-05-29T13:26:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mazeyrat](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mazeyrat/32/10955_2.png) [@mazeyrat](https://forum.inductiveautomation.com/u/mazeyrat)\
**Post date:** [May 29, 2019, 1:26pm UTC](https://forum.inductiveautomation.com/t/ignition-8-0-2-rc1-unexpected-error-executing-expression-db-tag/25397/1 "2019-05-29T13:26:04Z")

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During the creation of udt tags instance, I have the following error in the gateway

tags.execution.actors.expr

```auto
expr	29May2019 15:15:22	Unexpected error executing expression/db tag.
java.lang.NullPointerException: null

at com.inductiveautomation.ignition.gateway.tags.runtime.nodes.ExecutableTag.valueChanged(ExecutableTag.java:278)

at com.inductiveautomation.ignition.gateway.tags.actors.factories.value.AbstractValueGeneratingActor.fireValueChange(AbstractValueGeneratingActor.java:41)

at com.inductiveautomation.ignition.gateway.tags.actors.factories.value.AbstractValueGeneratingActor.fireValueChange(AbstractValueGeneratingActor.java:34)

at com.inductiveautomation.ignition.gateway.tags.actors.factories.value.AbstractExpressionActor.run(AbstractExpressionActor.java:131)

at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)

at java.base/java.util.concurrent.FutureTask.run(Unknown Source)

at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

```

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<div class="post-metadata">

**Author:** ![anjoroge](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/anjoroge/32/6698_2.png) [@anjoroge](https://forum.inductiveautomation.com/u/anjoroge)\
**Post date:** [May 29, 2019, 4:56pm UTC](https://forum.inductiveautomation.com/t/ignition-8-0-2-rc1-unexpected-error-executing-expression-db-tag/25397/2 "2019-05-29T16:56:24Z")

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Hi mazeyrat,

Could you provide me with a gateway backup of the issue for easy reproduction?

Thanks,  
Anthony

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<div class="post-metadata">

**Author:** ![mazeyrat](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mazeyrat/32/10955_2.png) [@mazeyrat](https://forum.inductiveautomation.com/u/mazeyrat)\
**Post date:** [May 30, 2019, 8:26pm UTC](https://forum.inductiveautomation.com/t/ignition-8-0-2-rc1-unexpected-error-executing-expression-db-tag/25397/3 "2019-05-30T20:26:46Z")

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Sorry I can’t send you a backup before next week.

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<div class="post-metadata">

**Author:** ![anjoroge](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/anjoroge/32/6698_2.png) [@anjoroge](https://forum.inductiveautomation.com/u/anjoroge)\
**Post date:** [May 31, 2019, 12:03am UTC](https://forum.inductiveautomation.com/t/ignition-8-0-2-rc1-unexpected-error-executing-expression-db-tag/25397/4 "2019-05-31T00:03:25Z")

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No problem send it whenever you are able to