Fix duplicate Set-Cookie

Signed-off-by: Kamil Tekiela <tekiela246@gmail.com>
(cherry picked from commit 6e5f8fd330)
Signed-off-by: Maurício Meneghini Fauth <mauricio@mfauth.net>

libraries/classes/Sql.php

@@ -832,8 +832,8 @@ class Sql
             $GLOBALS['querytime'] = $this->dbi->lastQueryExecutionTime;
 
             if (! defined('TESTSUITE')) {
-                // reopen session
-                session_start();
+                // reopen session but prevent PHP from sending the session cookie again
+                session_start(['use_cookies' => false]);
             }
 
             // Displays an error message if required and stop parsing the script