# Duplicate tracking\_has values

**URL:** <https://forum.mautic.org/t/duplicate-tracking-has-values/10511>\
**Category:** Product Support\
**Created:** [May 16, 2018, 6:56pm UTC](https://forum.mautic.org/t/duplicate-tracking-has-values/10511 "2018-05-16T18:56:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hammad-tfg](https://avatars.discourse-cdn.com/v4/letter/h/6f9a4e/32.png) [@hammad-tfg](https://forum.mautic.org/u/hammad-tfg)\
**Post date:** [May 16, 2018, 6:56pm UTC](https://forum.mautic.org/t/duplicate-tracking-has-values/10511/1 "2018-05-16T18:56:49Z")

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Hi,

We have noticed that the same `tracking_hash` value has been assigned to multiple contacts / leads. This results to an error where a recipients clicks the tracking URL like below:

`https://<instance>/email/unsubscribe/5af240024edb8`

and a different person is unsubscribed because the tracking\_hash value is the same and it just picks the first instance of that `tracking_hash` in `email_stats` table

The worst scenario is the same tracking\_hash value being assigned to 5 leads / contacts.

[https://github.com/mautic/mautic/issues/6093](https://github.com/mautic/mautic/issues/6093)

Please advise if anyone has seen this behaviour and if we can fix it somehow ?

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**Author:** ![silavapi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/silavapi/32/7424_2.png) [@silavapi](https://forum.mautic.org/u/silavapi)\
**Post date:** [October 17, 2019, 4:33pm UTC](https://forum.mautic.org/t/duplicate-tracking-has-values/10511/2 "2019-10-17T16:33:37Z")

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Closed on October 17, 2019, 4:33pm UTC