Fix latest posts sometimes showing duplicates

modules/Forum/classes/Forum.php

@@ -230,7 +230,7 @@ public function getLatestDiscussions($group_id = null, $secondary_groups = null,
 
 			$query = DB::getInstance()->query("(
 	        SELECT topics.id as id, topics.forum_id as forum_id, topics.topic_title as topic_title, topics.topic_creator as topic_creator, topics.topic_last_user as topic_last_user, topics.topic_date as topic_date, topics.topic_reply_date as topic_reply_date, topics.topic_views as topic_views, topics.locked as locked, topics.sticky as sticky, topics.label as label, topics.deleted as deleted, posts.id as last_post_id FROM nl2_topics topics LEFT JOIN nl2_posts posts ON topics.id = posts.topic_id AND posts.id = (SELECT MAX(id) FROM nl2_posts p WHERE p.topic_id = topics.id AND p.deleted = 0) WHERE topics.deleted = 0 AND topics.forum_id IN " . $all_topics_forums_string . " ORDER BY topics.topic_reply_date DESC LIMIT 50
-	        ) UNION ALL (
+	        ) UNION (
 	        SELECT topics.id as id, topics.forum_id as forum_id, topics.topic_title as topic_title, topics.topic_creator as topic_creator, topics.topic_last_user as topic_last_user, topics.topic_date as topic_date, topics.topic_reply_date as topic_reply_date, topics.topic_views as topic_views, topics.locked as locked, topics.sticky as sticky, topics.label as label, topics.deleted as deleted, posts.id as last_post_id FROM nl2_topics topics LEFT JOIN nl2_posts posts ON topics.id = posts.topic_id AND posts.id = (SELECT MAX(id) FROM nl2_posts p WHERE p.topic_id = topics.id AND p.deleted = 0) WHERE topics.deleted = 0 AND ((topics.forum_id IN " . $own_topics_forums_string . " AND topics.topic_creator = ?) OR topics.sticky = 1) ORDER BY topics.topic_reply_date DESC LIMIT 50
 	        ) ORDER BY topic_reply_date DESC LIMIT 50", array($user_id), PDO::FETCH_ASSOC)->results();
 		} else {