mark the session as stoped

src/Http/Session.php

@@ -379,7 +379,13 @@ class Session
             return true;
         }
 
-        return session_write_close();
+        if (!session_write_close()) {
+            throw new RuntimeException('Could not close the session');
+        }
+
+        $this->_started = false;
+
+        return true;
     }
 
     /**