Group Throws White Page

Hi Si team

The following groups throws a white page whilst not logged in:

http://finalbug.net/groups/item/17-learn-fcpx

I see:

Group Throws Error:
1 hour ago
Social Share

Other groups seem to be fine:

http://finalbug.net/groups/item/2-bug-all-members

http://finalbug.net/groups/item/18-learn-resolve

Please advise

Thanks

Paul

ps ES 1.4 Looks awsome