WARNING: PHP: 2024-04-18 17:47:58 (CEST): "Argument 1 passed to SciepediaUserManager::userSuggestedList() must be an instance of ElggUser, null given, called in /srv/sites/elgg-plugins/sciepedia/views/default/navigation/sidebar_suggest_friends.php on line 4 and defined" in file /srv/sites/elgg-plugins/sciepedia/classes/SciepediaUserManager.php (line 504)