Application stops on spinner when trying to edit new scheduled draft.

Steps:
1. Create a new Landing Page.
2. Click Publish Later.
3. Set publication time to e.g. 21/12/2017 16:45 (in the future).
4. Submit.
5. Go to dashboard.
6. Mark the new entry in the "All Drafts Scheduled for Future Publication" table.
7. Click the orange edit "pen" at the end of the row.
Actual: Spinner appears and applications hangs on dashboard, exception occurs in browser console (attached).
Expected: Studio editor loads and the new scheduled draft is opened.

Remarks: This is tricky because it does not occur every time so please try a few times.