diff --git a/src/Model/Post/Media.php b/src/Model/Post/Media.php
index 65cd099f7d..90f42a4593 100644
--- a/src/Model/Post/Media.php
+++ b/src/Model/Post/Media.php
@@ -229,7 +229,7 @@ class Media
 	 */
 	private static function fetchLocalData(array $media)
 	{
-		if (!preg_match('|.*?/photo/(.*[a-fA-F0-9])\-(.*[0-9])\..*[\w]|', $media['url'], $matches)) {
+		if (!preg_match('|.*?/photo/(.*[a-fA-F0-9])\-(.*[0-9])\..*[\w]|', $media['url'] ?? '', $matches)) {
 			return $media;
 		}
 		$photo = Photo::selectFirst([], ['resource-id' => $matches[1], 'scale' => $matches[2]]);
@@ -240,7 +240,7 @@ class Media
 			$media['height'] = $photo['height'];
 		}
 
-		if (!preg_match('|.*?/photo/(.*[a-fA-F0-9])\-(.*[0-9])\..*[\w]|', $media['preview'], $matches)) {
+		if (!preg_match('|.*?/photo/(.*[a-fA-F0-9])\-(.*[0-9])\..*[\w]|', $media['preview'] ?? '', $matches)) {
 			return $media;
 		}
 		$photo = Photo::selectFirst([], ['resource-id' => $matches[1], 'scale' => $matches[2]]);