diff --git a/include/functions_user.inc.php b/include/functions_user.inc.php
index 58469c3d7..4b44a8233 100644
--- a/include/functions_user.inc.php
+++ b/include/functions_user.inc.php
@@ -1131,6 +1131,9 @@ function auto_login() {
  */
 function try_log_user($username, $password, $remember_me)
 {
+  // we force the session table to be clean
+  pwg_session_gc();
+  
   global $conf;
   // retrieving the encrypted password of the login submitted
   $query = '