# \[BUG\] Error saving UDT tag changes: java.lang.StackOverflowError

**URL:** <https://forum.inductiveautomation.com/t/bug-error-saving-udt-tag-changes-java-lang-stackoverflowerror/24133>\
**Category:** Ignition Early Access\
**Created:** [April 15, 2019, 12:57am UTC](https://forum.inductiveautomation.com/t/bug-error-saving-udt-tag-changes-java-lang-stackoverflowerror/24133 "2019-04-15T00:57:34Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [April 15, 2019, 12:57am UTC](https://forum.inductiveautomation.com/t/bug-error-saving-udt-tag-changes-java-lang-stackoverflowerror/24133/1 "2019-04-15T00:57:34Z")

</div>

v8.0.0 (b2019040718)

I have had this error come up a few times when editing UDT tags.

```auto
ExecutionException: com.inductiveautomation.ignition.client.gateway_interface.GatewayException: java.lang.StackOverflowError
	caused by GatewayException: java.lang.StackOverflowError
	caused by ExecutionException: java.lang.StackOverflowError

Ignition v8.0.0 (b2019040718)
Java: Azul Systems, Inc. 11.0.2

```

It might only be affecting existing UDTs that have come from projects upgraded from v7.  
With this particular UDT, I’ve tried to add new tags, rename existing tags, and they all produce this error.  
I have tried to export, delete, and re-import the UDT but get the same error.

I’ve attached the json file.

[UDT\_DOL.json](https://us1.discourse-cdn.com/inductiveautomation/original/2X/5/5c083847ecad11994d4af82995d4dcb403294374.json) (7.0 KB)

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<div class="post-metadata">

**Author:** ![Colby.Clegg](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/colby.clegg/32/3282_2.png) [@Colby.Clegg](https://forum.inductiveautomation.com/u/Colby.Clegg)\
**Post date:** [April 17, 2019, 9:38pm UTC](https://forum.inductiveautomation.com/t/bug-error-saving-udt-tag-changes-java-lang-stackoverflowerror/24133/2 "2019-04-17T21:38:37Z")

</div>

Hi,

Unfortunately I can’t get this to occur with just the JSON file… you might be right that it may have to do with upgraded tags. If you could PM me a version 7 config.idb file, I could try with that, otherwise, perhaps a full 7.9 tag XML export?

Finally, does the error get logged on the gateway? If so, perhaps you could zip and post the wrapper.log or logfile export. With stack overflow errors, sometimes the full display isn’t very useful, because it just shows the repeated call, but any kind of extra information about where the error is occurring might be helpful. Thanks!