# Historian screwed up since I imported some tags

**URL:** <https://forum.inductiveautomation.com/t/historian-screwed-up-since-i-imported-some-tags/10705>\
**Category:** Ignition\
**Created:** [October 30, 2015, 7:11pm UTC](https://forum.inductiveautomation.com/t/historian-screwed-up-since-i-imported-some-tags/10705 "2015-10-30T19:11:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Pam3636](https://avatars.discourse-cdn.com/v4/letter/p/bc79bd/32.png) [@Pam3636](https://forum.inductiveautomation.com/u/Pam3636)\
**Post date:** [October 30, 2015, 7:11pm UTC](https://forum.inductiveautomation.com/t/historian-screwed-up-since-i-imported-some-tags/10705/1 "2015-10-30T19:11:26Z")

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A few days ago I imported some tags. After configuring the tags to log to the historian and initiating the data collection in the postgreSQL Database, none of those tags will push to the historian and I lost connection to the historical database on random tags across the database. Some tags are still plugging along logging data, but I cannot get any new ones to log. I’ve tried completely erasing the tags and entering them manually but nothing works. Since the time the values stopped logging coincides quite nearly with my tag import file, that action is my suspect.

Anyone have any advice on what I can do to fix this, or where I can begin to look?

Thanks!!!

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**Author:** ![Pam3636](https://avatars.discourse-cdn.com/v4/letter/p/bc79bd/32.png) [@Pam3636](https://forum.inductiveautomation.com/u/Pam3636)\
**Post date:** [November 2, 2015, 7:45pm UTC](https://forum.inductiveautomation.com/t/historian-screwed-up-since-i-imported-some-tags/10705/2 "2015-11-02T19:45:37Z")

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Figured out the problem - it was in the database. Every time a null came up it would wipe out random historian tags down the line.