diff --git a/src/Entity/User.php b/src/Entity/User.php
index 692c469..c8fb3a5 100644
--- a/src/Entity/User.php
+++ b/src/Entity/User.php
@@ -57,7 +57,7 @@ class User {
 
     public function __toString() : string
     {
-        return $this->fullname();
+        return "{$this->firstName} {$this->lastName}";
     }
 
     public function setPassword($password) : self
@@ -67,16 +67,16 @@ class User {
         return $this->hashPassword();
     }
 
-    public function hashPassword() : self
+    public function hashPassword(? string $password = null) : self
     {
-        $this->password = password_hash($this->password, PASSWORD_DEFAULT);
+        $this->password = password_hash($password ?: $this->password, PASSWORD_DEFAULT);
 
         return $this;
     }
 
     public function verifyPassword(string $password) : bool
     {
-        return password_verify($password, $this->password );
+        return password_verify($password, $this->password);
     }
 
     public function fullname() : string
diff --git a/src/Lib/Authenticate.php b/src/Lib/Authenticate.php
index 45e2b67..9d02681 100644
--- a/src/Lib/Authenticate.php
+++ b/src/Lib/Authenticate.php
@@ -35,8 +35,8 @@ class Authenticate {
 
     public function rememberMe(\Ulmus\Repository $repository) : ? User
     {
-        $logUser = function(int $id) use ($repository) {
-            if ( null === ( $user = $repository->loadFromPk($id) ) ) {
+        $logUser = function(? int $id) use ($repository) {
+            if ( $id === null || null === ( $user = $repository->loadFromPk($id) ) ) {
                 throw new \Exception("User not found.");
             }
 
@@ -123,7 +123,9 @@ class Authenticate {
             $this->cookie->delete('user.id');
         }
 
-        $this->user->logged = false;
+        if (isset($this->user)) {
+            $this->user->logged = false;
+        }
 
         return $this;
     }