diff --git a/index.php b/index.php
index 191459a..f6d6bc0 100755
--- a/index.php
+++ b/index.php
@@ -27,18 +27,18 @@
         }
         require("sudoku.php");
     } else {
+        $grid = new Grid();
+        $gridAsString = $grid->toString();
+        $newGridUrl = "$dirUrl/?$gridAsString";
+
+        session_id($gridAsString);
+        session_start(["use_cookies" => false]);
+
+        $_SESSION["nbSolutions"] = 1;
+
         if ($currentGrid) {
             require("400.php");
         } else {
-            $grid = new Grid();
-            $gridAsString = $grid->toString();
-            $newGridUrl = "$dirUrl/?$gridAsString";
-    
-            session_id($gridAsString);
-            session_start(["use_cookies" => false]);
-    
-            $_SESSION["nbSolutions"] = 1;
-
             header("Location: $newGridUrl");
         }
     }