Index: /trunk/roundcubemail/index.php
===================================================================
--- /trunk/roundcubemail/index.php	(revision 5116)
+++ /trunk/roundcubemail/index.php	(revision 5117)
@@ -156,5 +156,5 @@
 if (empty($RCMAIL->user->ID)) {
   // log session failures
-  if ($RCMAIL->task != 'login' && $RCMAIL->task != 'logout' && !$session_error && ($sess_id = $_COOKIE[ini_get('session.name')])) {
+  if (!in_array(get_input_value('_task', RCUBE_INPUT_GPC), array('login','logout')) && !$session_error && ($sess_id = $_COOKIE[ini_get('session.name')])) {
     $RCMAIL->session->log("Aborted session " . $sess_id . "; no valid session data found");
     $session_error = true;