diff --git a/Models/Collection.php b/Models/Collection.php
index 4efbedd..57c2968 100755
--- a/Models/Collection.php
+++ b/Models/Collection.php
@@ -140,7 +140,7 @@ class Collection extends Media implements \Iterator
     /**
      * {@inheritdoc}
      */
-    public function valid()
+    public function valid() : bool
     {
         return \current($this->sources) !== false;
     }
diff --git a/Models/Media.php b/Models/Media.php
index 9798c76..84ff3f4 100755
--- a/Models/Media.php
+++ b/Models/Media.php
@@ -257,7 +257,9 @@ class Media implements \JsonSerializable
      */
     public function setPassword(?string $password) : void
     {
-        $this->password = \password_hash($password, \PASSWORD_DEFAULT);
+        $temp = $password === null ? null : \password_hash($password, \PASSWORD_DEFAULT);
+
+        $this->password = $temp === false ? null : $temp;
     }
 
     /**
diff --git a/Models/MediaMapper.php b/Models/MediaMapper.php
index 78b8a4f..784c905 100755
--- a/Models/MediaMapper.php
+++ b/Models/MediaMapper.php
@@ -56,7 +56,7 @@ class MediaMapper extends DataMapperAbstract
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, self:string}>
+     * @var array<string, array{mapper:string, external:string}>
      * @since 1.0.0
      */
     protected static array $belongsTo = [