Its great to handle infinite loops message but it would be more useful if we could avoid infinite popups that don’t allow us to do anything else than clicking OK to see another identical message 
Yea I had exactly the same. Though in my case it switched the class several times (it circled through all classes which get called from inside of the loop).
There definitely seems to be room for improvement 
A different question though: Is there a concrete question you have or was it mainly feedback?
For feedback and a discussion about something the forum would be a better place. Specifically this one:
https://forums.unrealengine.com/forumdisplay.php?24-Feedback-for-Epic
Cheers
OK, how to get out of it? Only way is to force quit UE?
Yea it was back then.
Not sure how it is right now. I fixed the issue shortly after and never run into it again.