Preview is refreshed when block config is open.

Steps:
1. Go to a Landing page with Schedule block (e.g. Tasteful Planet).
2. Switch to Edit mode.
3. Add a e.g. Tag block.
4. Open the Settings form.
5. Wait for the minute to change on the clock.
Issue: "An unexpected error has occurred" message appears and exception is printed in log (attached).

Remarks: Please see attached screenshot.