diff --git a/inc/Engine/Common/PerformanceHints/Admin/Controller.php b/inc/Engine/Common/PerformanceHints/Admin/Controller.php
index 5856d55633..fb3152570f 100644
--- a/inc/Engine/Common/PerformanceHints/Admin/Controller.php
+++ b/inc/Engine/Common/PerformanceHints/Admin/Controller.php
@@ -64,6 +64,10 @@ private function delete_rows() {
 	 * @return void
 	 */
 	public function delete_post( $post_id ) {
+		if ( 'attachment' === get_post_type( $post_id ) ) {
+			return;
+		}
+
 		$url = get_permalink( $post_id );
 
 		// get_permalink should return false or string, but some plugins return null.
diff --git a/inc/Engine/Optimization/RUCSS/Admin/Subscriber.php b/inc/Engine/Optimization/RUCSS/Admin/Subscriber.php
index 2962c44b87..459e10337e 100644
--- a/inc/Engine/Optimization/RUCSS/Admin/Subscriber.php
+++ b/inc/Engine/Optimization/RUCSS/Admin/Subscriber.php
@@ -120,6 +120,10 @@ public function delete_used_css_on_update_or_delete( $post_id ) {
 			return;
 		}
 
+		if ( 'attachment' === get_post_type( $post_id ) ) {
+			return;
+		}
+
 		$url = get_permalink( $post_id );
 
 		if ( false === $url ) {
diff --git a/tests/Fixtures/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php b/tests/Fixtures/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php
index d7bb531977..10da29d203 100644
--- a/tests/Fixtures/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php
+++ b/tests/Fixtures/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php
@@ -5,6 +5,7 @@
 		'config' => [
 			'filter' => false,
 			'post_id' => 1,
+			'post_type' => 'post',
 			'url' => 'http://example.org',
 			'factories' => [
 				'get_admin_controller'
@@ -17,6 +18,7 @@
 			'filter' => true,
 			'post_id' => 1,
 			'url' => null,
+			'post_type' => 'post',
 		],
 		'expected' => false,
 	],
@@ -25,6 +27,7 @@
 			'filter' => true,
 			'post_id' => 1,
 			'url' => false,
+			'post_type' => 'post',
 		],
 		'expected' => false,
 	],
@@ -32,8 +35,18 @@
 		'config' => [
 			'filter' => true,
 			'post_id' => 1,
+			'post_type' => 'post',
 			'url' => 'http://example.org',
 		],
 		'expected' => true,
 	],
+	'testShoulNotDeletePostWithAttachmentPostType' => [
+		'config' => [
+			'filter' => true,
+			'post_id' => 1,
+			'post_type' => 'attachment',
+			'url' => 'http://example.org',
+		],
+		'expected' => false,
+	],
 ];
diff --git a/tests/Fixtures/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php b/tests/Fixtures/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php
index 3eddb2cbd3..154b912ed8 100644
--- a/tests/Fixtures/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php
+++ b/tests/Fixtures/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php
@@ -68,6 +68,7 @@
 				'url' => 'http://example.org/category/test/',
 				'files_deleted'     => [],
 				'files_preserved'   => array_merge( $files, $preserved ),
+				'post_type' => 'post'
 			]
 		],
 		'shouldDeleteOnUpdate' => [
@@ -80,6 +81,7 @@
 				'post_id' => 1,
 				'url' => 'http://example.org/category/test/',
 				'files_preserved'   => array_merge( $files, $preserved ),
+				'post_type' => 'post'
 			]
 		],
 		'shouldNotDeleteOnDisabledFilter' => [
@@ -92,6 +94,20 @@
 				'items'             => $items,
 				'files_deleted'     => [],
 				'files_preserved'   => array_merge( $files, $preserved ),
+				'post_type' => 'post'
+			]
+		],
+		'shouldNotDeleteOnAttachmentPostType' => [
+			'input' => [
+				'remove_unused_css' => true,
+				'is_disabled' => false,
+				'wp_error' => false,
+				'post_id' => 1,
+				'url' => 'http://example.org/category/test/',
+				'items'             => $items,
+				'files_deleted'     => [],
+				'files_preserved'   => array_merge( $files, $preserved ),
+				'post_type' => 'attachment'
 			]
 		]
 	]
diff --git a/tests/Unit/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php b/tests/Unit/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php
index 1c244493ef..3facd62f45 100644
--- a/tests/Unit/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php
+++ b/tests/Unit/inc/Engine/Common/PerformanceHints/Admin/Controller/deletePost.php
@@ -37,6 +37,8 @@ public function testShouldDoExpected( $config, $expected ) {
 		$controller = new Controller( ! $config['filter'] ? [] : $this->factories );
 
 		Functions\when( 'get_permalink' )->justReturn( $config['url'] );
+		Functions\when( 'get_post_type' )
+			->justReturn( $config['post_type'] );
 
 		if ( $expected ) {
 			$this->queries->expects( $this->once() )
diff --git a/tests/Unit/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php b/tests/Unit/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php
index 35fb9e9727..614bb46348 100644
--- a/tests/Unit/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php
+++ b/tests/Unit/inc/Engine/Optimization/RUCSS/Admin/Subscriber/deleteUsedCssOnUpdateOrDelete.php
@@ -42,6 +42,9 @@ public function testShouldDoExpected( $config ) {
 		Functions\when( 'get_permalink' )
 			->justReturn( $config['url'] );
 
+		Functions\when( 'get_post_type' )
+			->justReturn( $config['post_type'] );
+
 		$this->configureDeletion($config);
 
 		$this->subscriber->delete_used_css_on_update_or_delete( $config['post_id'] );