# Adding values together only if tag is true

**URL:** <https://forum.inductiveautomation.com/t/adding-values-together-only-if-tag-is-true/93640>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [July 23, 2024, 11:54pm UTC](https://forum.inductiveautomation.com/t/adding-values-together-only-if-tag-is-true/93640 "2024-07-23T23:54:34Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\
**Post date:** [July 24, 2024, 12:19am UTC](https://forum.inductiveautomation.com/t/adding-values-together-only-if-tag-is-true/93640/11 "2024-07-24T00:19:04Z")

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Thomas, hover over the Error\_ExpressionEval and report what it says.

In general you should be posting code, not pictures of code (unless the context is relevant). See [Wiki - how to post code on this forum](https://forum.inductiveautomation.com/t/wiki-how-to-post-code-on-this-forum/77831).

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