Sorry and thanks for this at the same time.
We missed accounting for the situation where groups are disabled. We'll release this fix, but need some help.
We couldn't reproduce these errors, but thanks to the errors, we could locate the offensive code. Could you help us test this?
You just need to replace wp-content/plugins/buddypress-media/app/main/privacy/BPMediaPrivacy.php with https://raw.github.com/rtCamp/buddypress-media/master/app/main/privacy/BPMediaPrivacy.php
and wp-content/plugins/buddypress-media/app/main/includes/BPMediaActions.php with https://raw.github.com/rtCamp/buddypress-media/master/app/main/includes/BPMediaActions.php