php - Prestashop 1.6.1.1 empty cart after Guest checkout -

i enabled guest checkout after checkout popup message cart empty! :-( product allow buying guest, i've checked out. can't find place in prestachop code witch responsible empty cart. supose happen jquery , ajax because message apears without page reloading. how check acctually happen cart object using firebug or other debuging tool?

i created logger function , i'm trying find out when cart becomes empty happens suddenly.

controllers\front\orderopccontroller.php      class orderopccontrollercore extends parentordercontroller { [...] public function init()         {             parent::init();     [...]      loggerclass::mylogger($this->context->cart, __line__); 

when add first product cart follwing output:

cart object (     [id] => 1872     [id_shop_group] => 1     [id_shop] => 1     [id_address_delivery] => 0     [id_address_invoice] => 0     [id_currency] => 1     [id_customer] => 0     [id_guest] => 5446     [id_lang] => 7     [recyclable] => 0     [gift] => 0     [gift_message] =>      [mobile_theme] => 0     [date_add] => 2016-02-06 00:18:59     [secure_key] =>      [id_carrier] => 0     [date_upd] => 2016-02-06 00:19:00     [checkedtos] =>      [pictures] =>      [textfields] =>      [delivery_option] =>      [allow_seperated_package] => 0     [_products:protected] => array         (             [0] => array                 (                     [id_product_attribute] => 31                     [id_product] => 22                     [cart_quantity] => 1                     [id_shop] => 1 

[...]

but after positive guest checkout message cartis empty , output empty cart too

cart object (     [id] =>      [id_shop_group] => 1     [id_shop] => 1     [id_address_delivery] => 0     [id_address_invoice] => 0     [id_currency] => 1     [id_customer] =>      [id_guest] => 0     [id_lang] => 7     [recyclable] => 0     [gift] => 0     [gift_message] =>      [mobile_theme] =>      [date_add] =>      [secure_key] =>      [id_carrier] => 0     [date_upd] =>      [checkedtos] =>      [pictures] =>      [textfields] =>      [delivery_option] =>      [allow_seperated_package] =>      [_products:protected] =>  

[...]

savebutton not disappears message account information saved successfully showing.