# Double entry in default watch list @ user preferences -\> registration impossible
**URL:** https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181
**Category:** Bug
**Created:** [28.Декабрь.2015 00:08:56 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181 "2015-12-28T00:08:56Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@rriemann](https://meta.discourse.org/u/rriemann)
#### Post date: [28.Декабрь.2015 00:08:56 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/1 "2015-12-28T00:08:56Z")
I run into the following issue:
By accident, I entered two times the same category into the default user preference field for the default watched categories.
Result: Accounts could not be created anymore
```plaintext
PG::UniqueViolation (ERROR: duplicate key value violates unique constraint "idx_category_users_u1" DETAIL: Key (user_id, category_id, notification_level)=(16, 11, 3) already exists. )
```
Solution: I removed the enry from the watch list so that the list was unique.
However, I would expect that Discourse doesn’t allow to add two times the same category to the watch list.
Best,
Robert
---
### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [28.Декабрь.2015 00:11:00 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/2 "2015-12-28T00:11:00Z")
What version are you on? We fixed this about a week or two ago via a unique table index.
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### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [28.Декабрь.2015 00:17:47 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/3 "2015-12-28T00:17:47Z")
Yeah we should definitely guard against this buggy site setting a bit better.
The bug is that if you add “default watch” == “bug bug” we allow you to save it.
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### Author:  [@rriemann](https://meta.discourse.org/u/rriemann)
#### Post date: [28.Декабрь.2015 00:18:37 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/4 "2015-12-28T00:18:37Z")
I’m on version `v1.5.0.beta7 +48`
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### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [28.Декабрь.2015 00:18:52 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/5 "2015-12-28T00:18:52Z")
Ok @techapj can you add this to your list? A client-side check for duplicates.
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### Author:  [@techAPJ](https://meta.discourse.org/u/techAPJ)
#### Post date: [28.Декабрь.2015 07:48:08 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/6 "2015-12-28T07:48:08Z")
I am not able to repro this issue. 😕
Once I select a category from category list, I am not able to select the same category again (as expected).
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### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [28.Декабрь.2015 08:41:27 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/7 "2015-12-28T08:41:27Z")
Can you repro this here @rriemann? or on [try.discourse.org](http://try.discourse.org)?
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### Author:  [@rriemann](https://meta.discourse.org/u/rriemann)
#### Post date: [28.Декабрь.2015 08:53:46 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/8 "2015-12-28T08:53:46Z")
I had category names like “A Announcements” and “B Announcements”. With the
Discourse version I stated above, I cannot reproduce this either. It must have
been a left over from a previous version, I guess. Now, the error message can
be googled with a solution, it should be fine. 🙂
---
### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [28.Декабрь.2015 09:36:35 UTC](https://meta.discourse.org/t/double-entry-in-default-watch-list-user-preferences-registration-impossible/37181/9 "2015-12-28T09:36:35Z")