'
```
`/upgrade` just asked me to do a `git pull` and a rebuild. Did so, but same error (most recent log above).
---
### Author:  [@cpradio](https://meta.discourse.org/u/cpradio)
#### Post date: [2017年六月6日 23:32 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/2 "2017-06-06T23:32:46Z")
Check the username length and the max/min length you permit for usernames. Chances are it no longer abides by the settings.
---
### Author:  [@chrisgalpin](https://meta.discourse.org/u/chrisgalpin)
#### Post date: [2017年六月6日 23:57 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/3 "2017-06-06T23:57:45Z")
They’re set for 3-20.
Old username is length of 10, new username is length of 11.
---
### Author:  [@cpradio](https://meta.discourse.org/u/cpradio)
#### Post date: [2017年六月7日 00:16 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/4 "2017-06-07T00:16:43Z")
Hmm.. works for me on the same version of Discourse you are on. Do you have any plugins installed that may be interfering?
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### Author:  [@tgxworld](https://meta.discourse.org/u/tgxworld)
#### Post date: [2017年六月7日 01:55 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/5 "2017-06-07T01:55:35Z")
Try upgrading to latest? This has been a problem for quite some time judging from the `TODO` comments in our codebase.
[https://github.com/discourse/discourse/commit/2cad739262e8a0be9a65a13263b103fa515ff082](https://github.com/discourse/discourse/commit/2cad739262e8a0be9a65a13263b103fa515ff082)
---
### Author:  [@chrisgalpin](https://meta.discourse.org/u/chrisgalpin)
#### Post date: [2017年六月7日 02:37 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/6 "2017-06-07T02:37:38Z")
“Username must be unique”
Well! That’s quite a bit more useful. 😛 Thanks.
(It indeed wasn’t unique.)
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### Author:  [@tgxworld](https://meta.discourse.org/u/tgxworld)
#### Post date: [2017年六月7日 02:46 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/7 "2017-06-07T02:46:32Z")
Just curious, are you updating the username via the API?
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### Author:  [@tophee](https://meta.discourse.org/u/tophee)
#### Post date: [2017年六月7日 22:38 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/10 "2017-06-07T22:38:43Z")
> [@tgxworld](#):
>
> This has been a problem for quite some time
I’ve had a 500 error when changing a user’s email address the other day (more precisely, he got the error when clicking the confirmation link). Could this be related?
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### Author:  [@tgxworld](https://meta.discourse.org/u/tgxworld)
#### Post date: [2017年六月7日 22:52 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/11 "2017-06-07T22:52:49Z")
Nope not related. This is in regards to changing a user’s username so it doesn’t affect changing a user’s email at all.
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### Author:  [@chrisgalpin](https://meta.discourse.org/u/chrisgalpin)
#### Post date: [2017年六月8日 01:16 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/12 "2017-06-08T01:16:04Z")
> [@tgxworld](#):
>
> are you updating the username via the API?
Nay, I was not. \
---
### Author:  [@tgxworld](https://meta.discourse.org/u/tgxworld)
#### Post date: [2017年六月8日 01:31 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/13 "2017-06-08T01:31:33Z")
That is strange because the client would have prevented you from submitting a name that was already taken.
---
### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [2017年六月8日 01:34 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/14 "2017-06-08T01:34:25Z")
Maybe related to SSO and automatic user creation?
---
### Author:  [@chrisgalpin](https://meta.discourse.org/u/chrisgalpin)
#### Post date: [2017年六月8日 07:41 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/15 "2017-06-08T07:41:10Z")
I deleted that existing user (had 0 posts) and proceeded with my rename, but from the logs I see:
> created\_at: 2013-01-02 18:01:31 UTC
> trust\_level: 1
> last\_seen\_at: 2013-01-02 18:01:52 UTC
> last\_emailed\_at: 2016-04-14 09:26:33 UTC
I did the import in 2016, around April 14th looks right.
So… it was an imported user… from very old forum. Doesn’t look like they ever logged in with that particular account?
Not sure if that helps.
---
### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [2017年六月8日 22:00 UTC](https://meta.discourse.org/t/500-error-on-username-edit/64064/16 "2017-06-08T22:00:22Z")
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