diff --git a/lib/resources/RoomManager.class.php b/lib/resources/RoomManager.class.php
index a362414e2f846c438ac64d8e11cbc8c54c9b1f2d..0932d453ceea50efd1e422ce819947410db64e2b 100644
--- a/lib/resources/RoomManager.class.php
+++ b/lib/resources/RoomManager.class.php
@@ -592,7 +592,7 @@ class RoomManager
         }
 
         $result = [];
-        if (is_array($time_ranges)) {
+        if (!empty($time_ranges)) {
             //We must check if the room is available:
             foreach ($filtered_rooms as $room) {
                 $room_is_available = true;