Steps to reproduce:

1. Log in to back office.
2. Go to Admin / Users.
3. Click on edit button for any of available sub-items at the bottom (sub-items table) e.g. Guest Accounts.
4. Verify console messages.

Actual result:

See attachment.

Uncaught TypeError: Cannot read property 'contains' of undefined.

Expected result:

Editing sub-item User groups shouldn't occurs any errors in console.