Random "Message is null"

This is a followup question to this here: Random 'Message is null'

I am randomly getting “Message is null” errors (see the post) and Stephan responded with: “I checked out the code, which is for handling old models (version <= 7.2). From the code, I understand that it has something to do with scopes and async before and async after.”

I was wondering if the problem is that “Async Before” is set when the “CallActivity Type” is set to BPMN. Any ideas if this might be the problem?

Just to be clear, I have “Async Before” set in on various steps in the BPMN that is being call as well as the Task that is in the origional processes!

Thanking you