fix: 不能创建本地镜像

react-ui/src/pages/Mirror/create.tsx

@@ -119,7 +119,7 @@ function MirrorCreate() {
 
   const beforeUpload: UploadProps['beforeUpload'] = () => {
     const fileList = form.getFieldValue('fileList');
-    if (fileList.length >= 1) {
+    if (Array.isArray(fileList) && fileList.length >= 1) {
       message.error('只允许上传一个文件');
       return Upload.LIST_IGNORE;
     }