# Multi-instance migration failed when adding a new instance

**URL:** https://meta.discourse.org/t/multi-instance-migration-failed-when-adding-a-new-instance/283554
**Category:** Bug
**Created:** [October 26, 2023, 3:28pm UTC](https://meta.discourse.org/t/multi-instance-migration-failed-when-adding-a-new-instance/283554 "2023-10-26T15:28:47Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![twofoursixeight](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/twofoursixeight/32/574822_2.png) [@twofoursixeight](https://meta.discourse.org/u/twofoursixeight)
#### Post date: [October 27, 2023, 12:51am UTC](https://meta.discourse.org/t/multi-instance-migration-failed-when-adding-a-new-instance/283554/3 "2023-10-27T00:51:09Z")

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I don’t have the best idea on this subject, but I could try to help.  
This topic is related:

> [@Migration failed upgrading to latest from ~3 weeks ago](https://meta.discourse.org/t/migration-failed-upgrading-to-latest-from-3-weeks-ago/211450):
>
> 1 migrations failed! Failed to migrate default #\<StandardError: An error has occurred, all later migrations canceled: PG::UniqueViolation: ERROR: duplicate key value violates unique constraint "index\_user\_emails\_on\_email" DETAIL: Key (lower(email::text))=(talk@remobjects.com\<mailto:talk@remobjects.com) already exists. \> /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rack-mini-profiler-2.3.3/lib/patches/db/pg.rb:110:in `exec' /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rack-mini-profil…

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