# \[IGN-5933\] A Derived tag's self-reference breaks when the tag name is changed

**URL:** <https://forum.inductiveautomation.com/t/ign-5933-a-derived-tags-self-reference-breaks-when-the-tag-name-is-changed/58706>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [April 21, 2022, 4:38pm UTC](https://forum.inductiveautomation.com/t/ign-5933-a-derived-tags-self-reference-breaks-when-the-tag-name-is-changed/58706 "2022-04-21T16:38:01Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Bryan\_Mason](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bryan_mason/32/30612_2.png) [@Bryan\_Mason](https://forum.inductiveautomation.com/u/Bryan_Mason)\
**Post date:** [April 21, 2022, 4:38pm UTC](https://forum.inductiveautomation.com/t/ign-5933-a-derived-tags-self-reference-breaks-when-the-tag-name-is-changed/58706/1 "2022-04-21T16:38:01Z")

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When I use a self-reference ({this}) in the Read Expression of a Derived tag, the reference breaks when I change the name of the tag. I would expect the self-reference to not be dependent on the name.

Last Published Value: `[null, Bad_NotFound("Path '[Testing]my_tag.tooltip' not found."), Thu Apr 21 10:31:14 MDT 2022 (1650558674394)]`  
Quality Diagnostics: `Path '[Testing]my_tag.tooltip' not found.`

Steps to reproduce:

1. Create a derived tag
2. Set source tag path to any other tag
3. Set Read Expression to `{this.tooltip}` or any other property
4. Click Apply
5. Change the name of the tag

Expression tags don’t have this bug, only Derived tags.

Ignition version 8.1.14

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**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [April 21, 2022, 8:17pm UTC](https://forum.inductiveautomation.com/t/ign-5933-a-derived-tags-self-reference-breaks-when-the-tag-name-is-changed/58706/2 "2022-04-21T20:17:43Z")

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Huh, good catch. If you restart the tag, the reference is fixed, at least.

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<div class="post-metadata">

**Author:** ![Bryan\_Mason](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bryan_mason/32/30612_2.png) [@Bryan\_Mason](https://forum.inductiveautomation.com/u/Bryan_Mason)\
**Post date:** [April 21, 2022, 9:28pm UTC](https://forum.inductiveautomation.com/t/ign-5933-a-derived-tags-self-reference-breaks-when-the-tag-name-is-changed/58706/3 "2022-04-21T21:28:58Z")

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You’re right. I didn’t realize you could restart a tag.