Cannot create a new Landing Page or edit existing one.

Steps:
1. Log in as admin.
2. Go to Page.
3. Click Create.
4. Click Landing Page.
Actual: Application stops on Home in View mode, error occurs in console (screenshot 1)
Expected: Form with layout selection appears.

Flow 2:
1. Go to Page.
2. On e.g. Home (Tasteful Planet) try to enter Edit mode form the View/Edit switch.
Actual: Application stops on Home in View mode, error occurs in console (screenshot 2)
Expected: Existing Landing Page is loaded in Edit mode.

Remarks: Please see attached.