diff --git a/Sources/Entity_Framework/Entity/Sessions.cs b/Sources/Entity_Framework/Entity/Sessions.cs
index 6158f8d..7d5474a 100644
--- a/Sources/Entity_Framework/Entity/Sessions.cs
+++ b/Sources/Entity_Framework/Entity/Sessions.cs
@@ -10,13 +10,13 @@ namespace Entity_Framework.Entity
     {
         public long Id { get; set; }
         public string Name { get; set; }
-        public string Type { get; set; }
-        public DateTime Date { get; set; }
+        public string? Type { get; set; }
+        public DateTime? Date { get; set; }
 
         // --------------------  Relation -------------------- //
         //Circuit 
-        public int IdCircuit { get; set; }
-        public Circuits Circuit { get; set; }
+        public int? IdCircuit { get; set; }
+        public Circuits? Circuit { get; set; }
 
         // Pilotes 
         public int IdPilote { get; set; }