Guest activities are not getting saved to the stream

We have an integration of JReviews activities with EasySocial and in the past even guest activities were stored in the stream. However, this is no longer the case. I am testing with the latest version of EasySocial. I can see these notices appear when the EasySocial stream code is run:

<li>[8] Trying to get property of non-object on line 474 in file /administrator/components/com_easysocial/includes/stream/template.php</li>



<li>[8] Trying to get property of non-object on line 475 in file /administrator/components/com_easysocial/includes/stream/template.php</li>

And in the following link you can find the code we use in JReviews to add the activities to the stream http://pastebin.com/TT0bfNUB