Finally the ultimate solution was to do :
if ((isset($_GET["SSID"])) || (isset($_GET["From"])) || (isset($_GET["To"]))) {
//GET Method from Recherche.php
$this->ssid = ($_GET["SSID"] == "null" ? null : $_GET["SSID"]);
$this->api->stickyGET("SSID"); // the solutiuon is here
$this->from = ($_GET["From"] == "null" ? null : $_GET["From"]);
$this->api->stickyGET("From"); // <===== the solutiuon is here
$this->to = ($_GET["To"] == "null" ? null : $_GET["To"]);
$this->api->stickyGET("To"); // <===== the solutiuon is here
}