Fatal error: Call to a member function getUserID() - php

Question

I am getting the following error when I check my site:
Fatal error: Call to a member function getUserID() on a non-object in /home/clientwo/public_html/main/registry/authenticate.php on line 104
This is the code:
<?php
class Authenticate {
private $user;
private $status;
private $loggedIn = false;
public function __construct(Registry $registry) {
$this->registry = $registry;
$this->status = 'User is logged out';
}
private function checkForAuthentication() {
if (isset($_SESSION['sn_auth_session_uid']) && $_SESSION['sn_auth_session_uid'] > 0) {
$this->sessionAuthenticate(intval($_SESSION['sn_auth_session_uid']));
}
}
private function sessionAuthenticate($id) {
//build a user model
require_once FRAMEWORK_PATH . 'model/user.php';
$this->user = new UserModel($this->registry, $id);
//check if user is valid etc
if ($this->user->isValid()) {
if (!$this->user->isActive()) {
$this->loggedIn = false;
$this->status = 'User has been deleted';
} else {
$this->loggedIn = true;
$this->status = 'User is logged in';
}
} else {
$this->loggedIn = false;
$this->status = 'User could not be found';
}
//make sure sessions are not set if user is not logged in
if (!$this->loggedIn) {
$this->logout();
}
}
public function login($username, $password) {
//first log out
$this->logout();
//execute query
$this->registry->getObject('mysql')->executeQuery("SELECT UserID FROM user WHERE Username='". $username . "' AND password='" . md5($password) . "'");
//check if query returned one row
if ($this->registry->getObject('mysql')->numRows() == 1) {
//get user row
$UserData = $this->registry->getObject('mysql')->getRow();
//build a user model
require_once FRAMEWORK_PATH . 'model/user.php';
$this->user = new UserModel($this->registry, $UserData['UserID']);
//check if user is valid and active etc
if ($this->user->isValid()) {
if ($this->user->isActive() == false) {
$this->loggedIn = false;
$this->status = 'User has been deleted';
} else {
$this->loggedIn = true;
$this->status = 'User is logged in';
$this->user->increaseLogins();
$this->user->update();
$_SESSION['sn_auth_session_uid'] = $this->user->getUserID();
}
} else {
$this->loggedIn = false;
$this->status = 'Authentication failed';
}
} else {
$this->loggedIn = false;
$this->status = 'Authentication failed';
}
}
function logout() {
//if such a session is set, unset it
if (isset($_SESSION['sn_auth_session_uid'])) {
unset($_SESSION['sn_auth_session_uid']);
}
//reset to logged out
$this->loggedIn = false;
//reset to null
$this->user = null;
}
public function isLoggedIn() {
$this->checkForAuthentication();
return $this->loggedIn;
}
public function isAdmin() {
$this->checkForAuthentication();
return $this->user->isAdmin();
}
public function getUser() {
$this->checkForAuthentication();
return $this->user;
}
public function getUserID() {
$this->checkForAuthentication();
return $this->user->getUserID();
}
public function getStatus() {
$this->checkForAuthentication();
return $this->status;
}
}
?>

Answer 1

This line is not returning the user object
$this->user = new UserModel($this->registry, $UserData['UserID']);