diff --git a/Sources/CoreLibrary/Core/Code.cs b/Sources/CoreLibrary/Core/Code.cs
index 747ba0d..c3da167 100644
--- a/Sources/CoreLibrary/Core/Code.cs
+++ b/Sources/CoreLibrary/Core/Code.cs
@@ -113,7 +113,7 @@ namespace CoreLibrary.Core
 
             for (int i = 0; i < mesJetons.Count; ++i)
             {
-                if (mesJetons[i] == sesJetons[i])
+                if (mesJetons[i]! == sesJetons[i]!)
                 {
                     mesJetons[i] = null;
                     sesJetons[i] = null;