diff --git a/making_school_asignment_app/lib/common/utils/app_upgrade/model/UpdateAppEvent.dart b/making_school_asignment_app/lib/common/utils/app_upgrade/model/UpdateAppEvent.dart
index 6db38c7..da3fbf3 100644
--- a/making_school_asignment_app/lib/common/utils/app_upgrade/model/UpdateAppEvent.dart
+++ b/making_school_asignment_app/lib/common/utils/app_upgrade/model/UpdateAppEvent.dart
@@ -62,7 +62,7 @@ class UpdateAppEvent {
       version: version, // 版本号
       title: json["title"] ?? "发现新版本", // title
       description: newDescription, //说明
-      link: json["downloadPath"], // 链接地址
+      link: json["downloadPath"]??'', // 链接地址
       upgrade: upgrade,
       deviceInfo: deviceInfo,
       appName: appName,