! Fixed crash on Unread Replies when using MySQL 5.7+ with default se…

…ttings. (UnreadReplies.php)

core/app/UnreadReplies.php

@@ -354,7 +354,7 @@ function UnreadReplies()
 		);
 	else
 		$request = wesql::query('
-			SELECT DISTINCT t.id_topic
+			SELECT DISTINCT t.id_topic, {raw:sort}
 			FROM {db_prefix}topics AS t
 				INNER JOIN {db_prefix}messages AS m ON (m.id_topic = t.id_topic AND m.id_member = {int:current_member})' . (strpos($_REQUEST['sort'], 'ms.') === false ? '' : '
 				INNER JOIN {db_prefix}messages AS ms ON (ms.id_msg = t.id_first_msg)') . (strpos($_REQUEST['sort'], 'mems.') === false ? '' : '