# Null Values from "Unknown" Quality Overlay

**URL:** <https://forum.inductiveautomation.com/t/null-values-from-unknown-quality-overlay/2909>\
**Category:** Ignition\
**Created:** [May 4, 2011, 6:46pm UTC](https://forum.inductiveautomation.com/t/null-values-from-unknown-quality-overlay/2909 "2011-05-04T18:46:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jasonpdavid](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@jasonpdavid](https://forum.inductiveautomation.com/u/jasonpdavid)\
**Post date:** [May 4, 2011, 6:46pm UTC](https://forum.inductiveautomation.com/t/null-values-from-unknown-quality-overlay/2909/1 "2011-05-04T18:46:00Z")

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I am having a problem with null values being reported when my quality overlay goes to “Unknown”. It forces “null” into the value and updates the SQL database with “null” which causes problems throughout my project.

When the quality overlay is any of the red overlays the values don’t go to null, only during the green “Unknown” overlay.

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**Author:** ![Carl.Gould](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/carl.gould/32/7262_2.png) [@Carl.Gould](https://forum.inductiveautomation.com/u/Carl.Gould)\
**Post date:** [May 30, 2011, 5:27am UTC](https://forum.inductiveautomation.com/t/null-values-from-unknown-quality-overlay/2909/2 "2011-05-30T05:27:04Z")

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> [@jasonpdavid](#):
>
> It forces "null" into the value and updates the SQL database with "null" which causes problems throughout my project.

Can you elaborate on both:

1. what system specifically do you mean when you say it forces null into the db
2. what problems are the nulls causing?