Bunch of red warnings

Problem/Motivation

If I use the stream or /explore there are following issues:

Warning: Undefined array key 0 in activity_creator_entity_view() (line 299 of profiles/contrib/social/modules/custom/activity_creator/activity_creator.module).

Warning: Undefined array key "#view_mode" in template_preprocess_activity() (line 54 of profiles/contrib/social/modules/custom/activity_creator/activity.page.inc).

Warning: Undefined array key "#view_mode" in Drupal\socialbase\Plugin\Preprocess\Activity->preprocess() (line 23 of themes/contrib/socialbase/src/Plugin/Preprocess/Activity.php).

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes