Changing to 'Socialwall' course format in a course causes coding error

[Atbins]

Hi, I would like an issue when creating a course, then switching to 'Socialwall' course format (after the course has been created) an error occurs.

Steps to replicate:

1. Create a new course
2. After the course is created, go to the course Settings and change Course format to 'Socialwall format'
3. Save and display
   Observation:
   An error is displayed after the format is changed to Socialwall (the error persists on the main course page even when navigating away/back again)
   
   Tested on the latest available version.

Thanks,