diff --git a/system/src/Grav/Common/Media/Traits/ImageMediaTrait.php b/system/src/Grav/Common/Media/Traits/ImageMediaTrait.php
index 51db194a5..ece36ae2c 100644
--- a/system/src/Grav/Common/Media/Traits/ImageMediaTrait.php
+++ b/system/src/Grav/Common/Media/Traits/ImageMediaTrait.php
@@ -467,6 +467,7 @@ trait ImageMediaTrait
     /**
      * Handle this commonly used variant
      *
+     * @param mixed $args
      * @return $this
      * @phpstan-impure
      */
diff --git a/system/src/Grav/Common/Page/Media.php b/system/src/Grav/Common/Page/Media.php
index 59a241256..de14ee2cd 100644
--- a/system/src/Grav/Common/Page/Media.php
+++ b/system/src/Grav/Common/Page/Media.php
@@ -22,7 +22,7 @@ class Media extends LocalMedia
     protected const VERSION = parent::VERSION . '.1';
 
     /** @var bool */
-    protected $useGlobalMedia;
+    protected bool $useGlobalMedia;
 
     /**
      * @param string|null $path
diff --git a/system/src/Grav/Common/Page/Medium/AbstractMedia.php b/system/src/Grav/Common/Page/Medium/AbstractMedia.php
index 6c4ae0d51..bf9ddcc1e 100644
--- a/system/src/Grav/Common/Page/Medium/AbstractMedia.php
+++ b/system/src/Grav/Common/Page/Medium/AbstractMedia.php
@@ -48,23 +48,23 @@ abstract class AbstractMedia implements ExportInterface, MediaCollectionInterfac
     /** @var string */
     protected const VERSION = '2';
 
-    protected ?string $path;
-    protected ?string $url;
+    protected ?string $path = null;
+    protected ?string $url = null;
     protected bool $exists = false;
-    protected ?array $index;
-    protected ?array $grouped;
+    protected ?array $index = null;
+    protected ?array $grouped = null;
     /** @var array<string,array|MediaObjectInterface> */
     protected array $items = [];
-    protected ?array $media_order;
+    protected ?array $media_order = null;
     protected array $config = [];
     protected array $settings = [];
     /** @var string[] */
     protected array $standard_exif = ['FileSize', 'MimeType', 'height', 'width'];
-    protected ?string $indexFolder;
+    protected ?string $indexFolder = null;
     protected ?string $indexFile = 'media.json';
     protected int $indexTimeout = 0;
     /** @var string|int|null */
-    protected $timestamp;
+    protected $timestamp = null;
     /** @var bool Hack to make Iterator work together with unset(). */
     private bool $iteratorUnset = false;