Partner Admin First Login Fails

[csehatt741]

Description
When a newly created Partner Admin tries to log in the first time it fails, as user.lastActiveAt is null:

Logging in the second time succeeds, as user.lastActiveAt is not null anymore.

To Reproduce
Steps to reproduce the behavior:

1. Log in with a Super Admin
2. Go to 'admin/dashboard' and create a new Partner Admin
3. Log out
4. Go to 'auth/login' and click on 'Reset here' to reset password
5. Enter the email of the newly created Partner Admin and click on 'Reset Password'
6. Open the reset password link sent to the email of the Partner Admin
7. Set the new password
8. Go to 'auth/login' and try to log in with the Partner Admin
9. See error There was an error retrieving your account.

Expected behavior: User should be logged in

On the backend side there is an exception thrown: TypeError: Cannot read properties of null (reading 'getDate')

/app/src/user/user.service.ts:250
      updateUserDto.lastActiveAt.getDate() === user.lastActiveAt.getDate()
                                                                 ^
TypeError: Cannot read properties of null (reading 'getDate')
    at UserService.updateUser (/app/src/user/user.service.ts:250:66)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)

Desktop

• OS: Windows 11
• Browser: Edge
• Version: 131.0.2903.112