diff --git a/BeatTogether.DedicatedServer.Kernel/Managers/LobbyManager.cs b/BeatTogether.DedicatedServer.Kernel/Managers/LobbyManager.cs
index 9d4e3d1..72e038b 100644
--- a/BeatTogether.DedicatedServer.Kernel/Managers/LobbyManager.cs
+++ b/BeatTogether.DedicatedServer.Kernel/Managers/LobbyManager.cs
@@ -413,6 +413,7 @@ private void CancelCountdown()
 
         private bool PlayerMapCheck(IPlayer p)
         {
+	    if(p.BeatmapIdentifier == null) return false;
             //If no map hash then treat as base game map for compat reasons and while waiting for a packet
             var Passed = string.IsNullOrEmpty(p.MapHash);
             //If not passed, then we have difficulties, and if we have the diff we are looking for, then we can check it for requirements.