Error message when opening a node

Hi,

I set up group for custom node type and I got this error message when opening a node.

Notice: Trying to access array offset on value of type null in Drupal\social_group\SocialGroupHelperService->getGroupFromEntity() (line 65 of profiles/contrib/social/modules/social_features/social_group/src/SocialGroupHelperService.php).

This is the line of code that cause issue. Sometimes the $this->cache is null, so I got this issue.

if ($read_cache && is_array($this->cache[$cache_type]) && isset($this->cache[$cache_type][$cache_id])) {
      return $this->cache[$cache_type][$cache_id];
}

My solution is: check null on $this->cache

if ($read_cache && isset($this->cache)&& is_array($this->cache[$cache_type]) && isset($this->cache[$cache_type][$cache_id])) {
      return $this->cache[$cache_type][$cache_id];
}