# Exclude Bad Tag Data for tag calculation query

**URL:** <https://forum.inductiveautomation.com/t/exclude-bad-tag-data-for-tag-calculation-query/41193>\
**Category:** Ignition\
**Created:** [December 3, 2020, 11:50pm UTC](https://forum.inductiveautomation.com/t/exclude-bad-tag-data-for-tag-calculation-query/41193 "2020-12-03T23:50:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nicholas.robinson](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nicholas.robinson/32/22188_2.png) [@nicholas.robinson](https://forum.inductiveautomation.com/u/nicholas.robinson)\
**Post date:** [December 3, 2020, 11:50pm UTC](https://forum.inductiveautomation.com/t/exclude-bad-tag-data-for-tag-calculation-query/41193/1 "2020-12-03T23:50:50Z")

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Is there any technical difficulty involved in adding an option to exclude bad tag values when using a tag calculation data source?

I’m curious to know why its not included.

Thanks,  
Nick