### Steps to reproduce

1. Be a user that has Begin of the insertion**more than one**End of the insertion Begin of the deletion aEnd of the deletion two factor authentication method set up.

2. Try to log in as that Begin of the insertionuser

3. OnEnd of the insertion Begin of the deletion user, stop atEnd of the deletion the screen where Begin of the insertionthe 2FA options are shown, switchEnd of the insertion Begin of the deletion you haveEnd of the deletion to Begin of the insertionanother method, don't do anything furtherEnd of the insertion Begin of the deletion select a two factor auth methodEnd of the deletion

Begin of the insertion4.End of the insertion Begin of the deletion 3.End of the deletion As an administrator, delete Begin of the insertion**all**End of the insertion the users two factor account methods

Begin of the insertion5.End of the insertion Begin of the deletion 4.End of the deletion As the user, Begin of the insertiontry to sign in again, enter emailEnd of the insertion Begin of the deletion cancel the started login processEnd of the deletion and Begin of the insertionpassword and try toEnd of the insertion sign in Begin of the deletion againEnd of the deletion


### What is the buggy behavior?

* Instead of successfully logging in it shows a 500 error


This behavior showed up, when my old community account was reactivated and I do not have access to the old two factor code anymore. So I tried to sign in, an administrator deleted my 2fa methods and then I tried to sign in again.

The fix was deleting my session cookie and then logging in again.

Reason for this is that the session has the currently selected 2fa device stored in a session variable and when trying to find this device it throws the error because it cannot be found anymore

### What is the expected behavior?

1. The user should be able to sign in, eventhough the session currently has a non existant 2fa device stored.


### Screenshots and other files

_If you have screenshots of the application's bug behavior or other relevant files, please drag them into this place or attach them using the "Files" section._

### Environment information

_Community_

**OpenProject version**

_15.0.1_

**Browser**

* [ ] Chrome
* [x] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [ ] Windows
* [x] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)

**Language**

_German_