### Steps to reproduce

_Please write down the steps to reproduce. Try to write down all necessary preconditions (what permissions do you have, are other users involved?). Example:_

1. Login as admin
2. Go to  **Administration -> Begin of the insertionUsers and permissionsEnd of the insertion Begin of the deletion System SettingsEnd of the deletion -> Begin of the insertionUsers settings**End of the insertion Begin of the deletion Display**End of the deletion
3. Begin of the insertionUnder **Display Format,** selectEnd of the insertion Begin of the deletion Change `User display format` to `admin` (i.e.End of the deletion the Begin of the insertion"username" format (e.g. "admin")End of the insertion Begin of the deletion username)End of the deletion
4. Begin of the insertionClick on **Save**
5. End of the insertion Go to  **Administration -> Work packages -> Custom actions**
Begin of the insertion6.End of the insertion Begin of the deletion 5.End of the deletion Click on Begin of the insertion"`+`" Button or the "`+ Custom action`" buttonEnd of the insertion Begin of the deletion "`+`"-ButtonEnd of the deletion

### What is the buggy behavior?

_Please describe the bug in as much detail as possible. Example:_

* Expected Page did not load
* There was an error notification shown with the message "\[Error 500\] An error occurred on the page you were trying to access. If you continue to experience problems please contact your Wholestack bracket administrator for assistance."

### What is the expected behavior?

_Describe how the application should behave like. Example:_

1. The application should show the `New custom action` dialogue
2. The same applies to the editing of existing actions

### Important note

_Please note that unless you are a contributor to OpenProject, you can no longer edit this bug report after saving. You can still add new comments, but no longer add any new images or other attachments. Please make sure that all necessary information and attachments are added, and the following attributes are set:_

### **Logs** Begin of the insertion

End of the insertion Begin of the deletion



End of the deletion ```log
openproject-web-1 | I, [2023-07-05T10:00:33.137631 #74] INFO -- : Started GET "/admin/custom_actions/new" for x.x.x.x 2023-07-05 10:00:33 +0000
openproject-web-1 | I, [2023-07-05T10:00:33.139434 #74] INFO -- : Processing by CustomActionsController#new as HTML
openproject-web-1 | I, [2023-07-05T10:00:33.162739 #74] INFO -- : Rendered custom_actions/new.html.erb within layouts/admin (Duration: 16.6ms | Allocations: 11392)
openproject-web-1 | I, [2023-07-05T10:00:33.162796 #74] INFO -- : Rendered layout layouts/admin.html.erb (Duration: 16.7ms | Allocations: 11420)
openproject-web-1 | E, [2023-07-05T10:00:33.171082 #74] ERROR -- : user=3 missing attribute: login: missing attribute: login
openproject-web-1 | I, [2023-07-05T10:00:33.171667 #74] INFO -- : Rendered common/error.html.erb within layouts/no_menu (Duration: 0.2ms | Allocations: 95)
openproject-web-1 | I, [2023-07-05T10:00:33.194307 #74] INFO -- : Rendered layouts/base.html.erb (Duration: 22.5ms | Allocations: 24009)
openproject-web-1 | I, [2023-07-05T10:00:33.194374 #74] INFO -- : Rendered layout layouts/no_menu.html.erb (Duration: 22.9ms | Allocations: 24185)
openproject-web-1 | I, [2023-07-05T10:00:33.194520 #74] INFO -- : Completed 500 Internal Server Error in 55ms (Views: 21.1ms | ActiveRecord: 6.2ms | Allocations: 51604)
openproject-web-1 | I, [2023-07-05T10:00:33.586563 #74] INFO -- : Started GET "/api/v3/configuration" for x.x.x.x 2023-07-05 10:00:33 +0000
openproject-web-1 | I, [2023-07-05T10:00:33.596514 #74] INFO -- : duration=8.60 db=1.27 view=7.33 status=200 method=GET path=/api/v3/configuration params={} host=openproject.somedomain user=3
openproject-web-1 | I, [2023-07-05T10:00:33.625134 #74] INFO -- : Started GET "/api/v3/users/3/avatar" for x.x.x.x 2023-07-05 10:00:33 +0000
openproject-web-1 | I, [2023-07-05T10:00:33.633036 #74] INFO -- : duration=6.61 db=1.32 view=5.29 status=200 method=GET path=/api/v3/users/3/avatar params={} host=openproject.somedomain user=3
openproject-web-1 | I, [2023-07-05T10:00:33.659103 #74] INFO -- : Started GET "/api/v3/notifications?pageSize=0&filters=%5B%7B%22readIAN%22%3A%7B%22operator%22%3A%22%3D%22%2C%22values%22%3A%5B%22f%22%5D%7D%7D%5D" for x.x.x.x 2023-07-05 10:00:33 +0000
openproject-web-1 | I, [2023-07-05T10:00:33.669919 #74] INFO -- : duration=9.46 db=2.06 view=7.40 status=200 method=GET path=/api/v3/notifications params={"pageSize"=>"0", "filters"=>"[{\"readIAN\":{\"operator\":\"=\",\"values\":[\"f\"]}}]"} host=openproject.somedomain user=3
openproject-web-1 | I, [2023-07-05T10:00:33.846258 #74] INFO -- : Started GET "/api/v3/capabilities?pageSize=-1&filters=%5B%7B%22principal%22%3A%7B%22operator%22%3A%22%3D%22%2C%22values%22%3A%5B%223%22%5D%7D%7D%2C%7B%22context%22%3A%7B%22operator%22%3A%22%3D%22%2C%22values%22%3A%5B%22g%22%5D%7D%7D%2C%7B%22action%22%3A%7B%22operator%22%3A%22%3D%22%2C%22values%22%3A%5B%22projects%2Fcreate%22%5D%7D%7D%5D" for x.x.x.x 2023-07-05 10:00:33 +0000
openproject-web-1 | I, [2023-07-05T10:00:33.880665 #74] INFO -- : duration=32.97 db=11.19 view=21.78 status=200 method=GET path=/api/v3/capabilities params={"pageSize"=>"-1", "filters"=>"[{\"principal\":{\"operator\":\"=\",\"values\":[\"3\"]}},{\"context\":{\"operator\":\"=\",\"values\":[\"g\"]}},{\"action\":{\"operator\":\"=\",\"values\":[\"projects/create\"]}}]"} host=openproject.somedomain user=3
```

_Are there errors in the browser console? (_[_Click here for information on how to open your browser's console_](https://webmasters.stackexchange.com/a/77337)_) For a local installation: Are there relevant logs output by_ `_openproject logs_` _(packaged installation) (_[_click here for details_](https://docs.openproject.org/installation-and-operations/operation/monitoring/#show-logs)_) or in a log/production.log or /var/log/openproject/ ? Please attach error output in these log files if applicable_

### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/59511/content"> Begin of the deletion

End of the deletion <img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/59512/content">

### Environment information

_Please check and fill out the following details to help us identify in what versions and distributions of OpenProject the error occurs_

**OpenProject installation type**

* [ ] Hosted cloud edition
* [ ] Packaged installation
* What distribution?
* [ ] Docker All-in-one container
* [x] Docker-compose installation
* [ ] Other (please specify)

**OpenProject version**

**12.5.7**

**Browser**

* [ ] Chrome
* [x] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [x] Opera

**Language**

_&quot;en\_DE&quot; English, German Date and Number-Formats_