this is around line 212
// Load cart session data from session
foreach ( $this->cart_session_data as $key => $default ) {
$this->$key = WC()->session->get( $key, $default );
}
$update_cart_session = false;
$this->removed_cart_contents = array_filter( WC()->session->get( ‘removed_cart_contents’, array() ) );
$this->applied_coupons = array_filter( WC()->session->get( ‘applied_coupons’, array() ) );
/**
* Load the cart object. This defaults to the persistant cart if null.
*/