diff --git a/app/src/plugin/index.ts b/app/src/plugin/index.ts
index da248e561..564b5597b 100644
--- a/app/src/plugin/index.ts
+++ b/app/src/plugin/index.ts
@@ -258,7 +258,7 @@ export class Plugin {
         this.setting.open(this.displayName || this.name);
     }
 
-    public loadData(storageName: string) {
+    public loadData(storageName: string): Promise<IWebSocketData> {
         if (typeof this.data[storageName] === "undefined") {
             this.data[storageName] = "";
         }
@@ -274,7 +274,7 @@ export class Plugin {
         });
     }
 
-    public saveData(storageName: string, data: any) {
+    public saveData(storageName: string, data: any): Promise<any | IWebSocketData> {
         if (window.siyuan.config.readonly || window.siyuan.isPublish) {
             return Promise.reject({
                 code: 403,
@@ -312,7 +312,7 @@ export class Plugin {
         });
     }
 
-    public removeData(storageName: string) {
+    public removeData(storageName: string): Promise<IWebSocketData> {
         if (window.siyuan.config.readonly || window.siyuan.isPublish) {
             return Promise.reject({
                 code: 403,
diff --git a/app/src/util/fetch.ts b/app/src/util/fetch.ts
index ece58ee61..caf6f1a21 100644
--- a/app/src/util/fetch.ts
+++ b/app/src/util/fetch.ts
@@ -93,6 +93,14 @@ export const fetchPost = (
             cb(response);
         }
     }).catch((e) => {
+        if (failCallback && url === "/api/file/getFile") {
+            failCallback({
+                data: null,
+                msg: e.message,
+                code: 400,
+            });
+            return;
+        }
         console.warn("fetch post failed [" + e + "], url [" + url + "]");
         if (url === "/api/transactions" && (e.message === "Failed to fetch" || e.message === "Unexpected end of JSON input")) {
             kernelError();