diff --git a/Qwirkle/QwirkleClassLibrary/Tiles/TileBag.cs b/Qwirkle/QwirkleClassLibrary/Tiles/TileBag.cs
index 44c7129..291a4d0 100644
--- a/Qwirkle/QwirkleClassLibrary/Tiles/TileBag.cs
+++ b/Qwirkle/QwirkleClassLibrary/Tiles/TileBag.cs
@@ -14,7 +14,7 @@ namespace QwirkleClassLibrary.Tiles
         [DataMember]
         private readonly List<Tile> tiles = [];
         
-        public ReadOnlyCollection<Tile> TilesBag { get; private set; }
+        public ReadOnlyCollection<Tile>? TilesBag { get; private set; }
         
 
         /// <summary>