diff --git a/src/Factory.php b/src/Factory.php
index 77be598..287ac81 100644
--- a/src/Factory.php
+++ b/src/Factory.php
@@ -19,21 +19,21 @@ class Factory
     public function __construct(
         private PersistenceInterface $db,
         private RequestInterface $request,
-        private null|SessionInterface $session,
-        private null|\PSR\Clock\ClockInterface $csrfClock,
-        private null|AntiCSRFInterface $csrf,
-        private null|\PSR\Clock\ClockInterface $totpClock,
-        private null|HashInterface $hash,
+        private ?SessionInterface $session,
+        private ?\PSR\Clock\ClockInterface $csrfClock,
+        private ?AntiCSRFInterface $csrf,
+        private ?\PSR\Clock\ClockInterface $totpClock,
+        private ?HashInterface $hash,
     )
     {
-        $this->session ? : $this->session = new Session\Base();
-        $this->csrf_clock ? : $this->csrfClock = new Clock\Request();
-        $this->csrf ? : $this->csrf = new AntiCSRF\Base(
+        !is_null($this->session)? : $this->session = new Session\Base();
+        !is_null($this->csrf_clock)? : $this->csrfClock = new Clock\Request();
+        !is_null($this->csrf)? : $this->csrf = new AntiCSRF\Base(
             $this->session,
             $this->csrf_clock
         );
-        $this->totp_clock ? : $this->totpClock = new Clock\Base();
-        $this->$hash ? : $this->hash = new Hash\HMAC_SHA1();
+        !is_null($this->totp_clock)? : $this->totpClock = new Clock\Base();
+        !is_null($this->$hash)? : $this->hash = new Hash\HMAC_SHA1();
     }
 
     public function userManagement(mixed $userIndex): UserManagement