Superadmin can't remove a secondary role from themselves, but ought to be able

[nep]

Description of the problem
As a Superadmin, I should be able to change what secondary roles are assigned to my own account.
Instead, you get an error message when you try.
I understand that you should not be able to remove your own superadmin status. But other roles should be modifiable.

How To Reproduce
Steps to reproduce the behavior:
Go to the Member page. admin.php?/cp/members
For your own superadmin account, go to edit your "Roles"
You'll get an error

Error Messages

500: Internal Server Error
Super Admins cannot change their role assignment. Please have another Super Admin reassign you.

Screenshots / Videos / Template Code

Environment Details:

• Version: 7.5.7
• PHP Version doesn't matter
• MySQL Version doesn't matter
• OS: doesn't matter
• Web Server: doesn't matter

Possible Solution
it's just a logic check.

[robinsowell]

I confirm, and what's more the 'Roles' section for me now longer appears on my profile page. I can't add or remove roles, and this is a change from prior behavior.

FWIW, I CAN access it for other users who have Superadmin as their primary role.