Komento Activities module did not show comments from guests

I just play arround in my demo environment (so i couldn´t give a link) with the "Komento Activities" module. However all it shows in the code is the following:

<div class="kmt-mod mod_komento_activities kmt-mod-activities">

	</div>

when i use a template overwrite and add a

print_r($activities);

it showed the following:

Array

(

)

So it looks like the activities array is fully empty. Any idea what might cause that?

P.S.
- The Komento Activities module is activated (version 1.0.4).
- All my postings on my demo side are written by visitors who do not have a joomla account (not sure if thats important to know)

Update / Troubleshooting:
changed the "mod_komento_activities.php" and put the following in it:

print_r($model);

which showed some results. However the following:

print_r($activities);

Showed an empty array as well... So it looks like "getUserActivities" didn´t give out some results...

So I had a peak inside activity.php and saw that you query the komento_activities DB, however its fully empty on my demo system yet. BUT i have comments ...

I checked now my live website and inside my live website I have some entries in the komento_activities DB. BUT the oldest ist from 2012-11-20 12:16:04 while my last comment is from 2016-03-26 06:28:06

Conclusion:
So it looks like that something is no longer filling the komento_activities DB after a upgrade from the Komento application (or i disabled someting which i couldn´t find).

So can you check that please? You should be able to reproduce that issue in your environment with a fresh Komento installation like i have done in my demo environment.