diff --git a/php/servers/servers-rooms.php b/php/servers/servers-rooms.php
index 9d2cd69..607738c 100644
--- a/php/servers/servers-rooms.php
+++ b/php/servers/servers-rooms.php
@@ -513,10 +513,10 @@
 		 */
 		public static function select_rooms(array $rooms, array|string $filter, array &$matchees = null): array {
 			$_matchees = [];
-			$rooms = array_values(array_filter($rooms, function(CommunityRoom $room) use ($filter, $_matchees) {
+			$rooms = array_values(array_filter($rooms, function(CommunityRoom $room) use ($filter, &$_matchees) {
 				$matchee = null;
 				$success = $room->matched_by_list($filter, $matchee);
-				if ($matchee != null) $_matchees[] = $matchee;
+				if ($success) $_matchees[] = $matchee;
 				return $success;
 			}));
 			$matchees = $_matchees;