diff --git a/aliyun-oss-wordpress.php b/aliyun-oss-wordpress.php
index eaa4236..bbd3c27 100644
--- a/aliyun-oss-wordpress.php
+++ b/aliyun-oss-wordpress.php
@@ -3,7 +3,7 @@
 Plugin Name: OSS Aliyun
 Plugin URI: https://github.com/sy-records/aliyun-oss-wordpress
 Description: 使用阿里云对象存储 OSS 作为附件存储空间。（This is a plugin that uses Aliyun Object Storage Service for attachments remote saving.）
-Version: 1.4.4
+Version: 1.4.6
 Author: 沈唁
 Author URI: https://qq52o.me
 License: Apache2.0
@@ -20,7 +20,7 @@ use OSS\Credentials\CredentialsProvider;
 use AlibabaCloud\Credentials\Credential;
 use OSS\Credentials\StaticCredentialsProvider;
 
-define('OSS_VERSION', '1.4.4');
+define('OSS_VERSION', '1.4.6');
 define('OSS_BASEFOLDER', plugin_basename(dirname(__FILE__)));
 
 if (!function_exists('get_home_path')) {
@@ -251,6 +251,10 @@ function oss_upload_attachments($metadata)
  */
 function oss_upload_thumbs($metadata)
 {
+    if (empty($metadata['file'])) {
+        return $metadata;
+    }
+
     //获取上传路径
     $wp_uploads = wp_upload_dir();
     $basedir = $wp_uploads['basedir'];
@@ -261,22 +265,20 @@ function oss_upload_thumbs($metadata)
     $no_local_file = esc_attr($oss_options['nolocalsaving']) == 'true';
     $no_thumb = esc_attr($oss_options['nothumb']) == 'true';
 
-    if (!empty($metadata['file'])) {
-        // Maybe there is a problem with the old version
-        $file = $basedir . '/' . $metadata['file'];
-        if ($upload_path != '.') {
-            $path_array = explode($upload_path, $file);
-            if (count($path_array) >= 2) {
-                $object = '/' . $upload_path . end($path_array);
-            }
-        } else {
-            $object = '/' . $metadata['file'];
-            $file = str_replace('./', '', $file);
+    // Maybe there is a problem with the old version
+    $file = $basedir . '/' . $metadata['file'];
+    if ($upload_path != '.') {
+        $path_array = explode($upload_path, $file);
+        if (count($path_array) >= 2) {
+            $object = '/' . $upload_path . end($path_array);
         }
-
-        oss_file_upload($object, $file, $no_local_file);
+    } else {
+        $object = '/' . $metadata['file'];
+        $file = str_replace('./', '', $file);
     }
 
+    oss_file_upload($object, $file, $no_local_file);
+
     //得到本地文件夹和远端文件夹
     $dirname = dirname($metadata['file']);
     $file_path = $dirname != '.' ? "{$basedir}/{$dirname}/" : "{$basedir}/";
diff --git a/readme.txt b/readme.txt
index 1348f55..6368502 100644
--- a/readme.txt
+++ b/readme.txt
@@ -5,7 +5,7 @@ Tags: oss, 阿里云, 对象存储, aliyun
 Requires at least: 4.2
 Tested up to: 6.3
 Requires PHP: 7.0
-Stable tag: 1.4.5
+Stable tag: 1.4.6
 License: Apache2.0
 License URI: http://www.apache.org/licenses/LICENSE-2.0.html
 
@@ -73,6 +73,10 @@ License URI: http://www.apache.org/licenses/LICENSE-2.0.html
 
 == Changelog ==
 
+= 1.4.6 =
+
+- 修复 pdf 等文件格式上传时报错
+
 = 1.4.5 =
 
 - 兼容 PHP 7.0