diff --git a/classes/eml/Controller/class-external-files.php b/classes/eml/Controller/class-external-files.php
index dc4c87b..d5c1504 100644
--- a/classes/eml/Controller/class-external-files.php
+++ b/classes/eml/Controller/class-external-files.php
@@ -709,7 +709,7 @@ public function get_file_by_url( string $url ): ?External_File {
 			$result = new WP_Query( $query );
 			if ( 1 === $result->post_count ) {
 				$external_file_obj = $this->get_file( $result->posts[0] );
-				if ( $external_file_obj->is_valid() ) {
+				if ( $external_file_obj && $external_file_obj->is_valid() ) {
 					return $external_file_obj;
 				}
 			}
@@ -742,7 +742,7 @@ public function get_file_by_title( string $title ): bool|External_File {
 			$result = new WP_Query( $query );
 			if ( 1 === $result->post_count ) {
 				$external_file_obj = $this->get_file( $result->posts[0] );
-				if ( $external_file_obj->is_valid() ) {
+				if ( $external_file_obj && $external_file_obj->is_valid() ) {
 					return $external_file_obj;
 				}
 			}
diff --git a/classes/eml/Controller/class-init.php b/classes/eml/Controller/class-init.php
index 770c774..27d452a 100644
--- a/classes/eml/Controller/class-init.php
+++ b/classes/eml/Controller/class-init.php
@@ -286,7 +286,8 @@ public function image_downsize( array|bool $result, int $attachment_id ): bool|a
 
 		// check if the file is an external file, an image and if it is really external hosted.
 		if (
-			$external_file_obj->is_valid()
+			$external_file_obj
+			&& $external_file_obj->is_valid()
 			&& false === $external_file_obj->is_locally_saved()
 			&& $external_file_obj->is_image()
 		) {
@@ -324,7 +325,8 @@ public function wp_calculate_image_srcset( array $sources, array $size_array, st
 
 		// check if the file is an external file, an image and if it is really external hosted.
 		if (
-			$external_file_obj->is_valid()
+			$external_file_obj
+			&& $external_file_obj->is_valid()
 			&& false === $external_file_obj->is_locally_saved()
 			&& $external_file_obj->is_image()
 		) {
@@ -349,7 +351,8 @@ public function prevent_external_attachment_in_export( array $value, array $para
 
 			// check if the file is an external file, an image and if it is really external hosted.
 			if (
-				$external_file_obj->is_valid()
+				$external_file_obj
+				&& $external_file_obj->is_valid()
 				&& false === $external_file_obj->is_locally_saved()
 				&& $external_file_obj->is_image()
 			) {
@@ -424,7 +427,7 @@ public function wp_get_attachment_metadata( array $data, int $attachment_id ): a
 		$external_file_obj = $this->external_files_obj->get_file( $attachment_id );
 
 		// check if the file is an external file.
-		if ( $external_file_obj->is_valid() ) {
+		if ( $external_file_obj && $external_file_obj->is_valid() ) {
 			$data['file'] = get_permalink( $attachment_id );
 		}
 		return $data;
diff --git a/readme.txt b/readme.txt
index bd93a60..8ada61c 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,11 +2,11 @@
 Contributors: threadi
 Tags: external files, media library, media
 Requires at least: 6.2
-Tested up to: 6.5.3
+Tested up to: 6.6
 Requires PHP: 8.0
 License: GPL-2.0-or-later
 License URI: https://www.gnu.org/licenses/gpl-2.0.html
-Stable tag: 1.2.1
+Stable tag: 1.2.2
 
 Add external files to your media library to link or embed them in your website. They will be integrated as if they were locally available.
 
@@ -88,3 +88,8 @@ No, only public files can be used.
 * Added support for hook of plugin "Download List Block with Icons" for mark external files with rel-external
 * Updated compatibility-flag for WordPress 6.5.3
 * Updated dependencies
+
+= 1.2.2 =
+* Updated compatibility-flag for WordPress 6.6
+* Updated dependencies
+* Fixed potential error on attachment pages