diff --git a/app/src/plugin/index.ts b/app/src/plugin/index.ts
index 7f678b6bc..8e242b9cf 100644
--- a/app/src/plugin/index.ts
+++ b/app/src/plugin/index.ts
@@ -12,7 +12,7 @@ import {hasClosestByAttribute} from "../protyle/util/hasClosest";
 export class Plugin {
     public i18n: IObject;
     public eventBus: EventBus;
-    public data: any;
+    public data: any = {};
     public name: string;
     public topBarIcons: Element[] = [];
     public models: {
@@ -75,17 +75,12 @@ export class Plugin {
     }
 
     public loadData(storageName: string) {
-        if (!this.data) {
-            this.data = {};
-        }
         if (typeof this.data[storageName] === "undefined") {
             this.data[storageName] = "";
         }
         return new Promise((resolve) => {
             fetchPost("/api/file/getFile", {path: `/data/storage/petal/${this.name}/${storageName}`}, (response) => {
-                if (response.code === 404) {
-                    this.data[storageName] = "";
-                } else {
+                if (response.code !== 404) {
                     this.data[storageName] = response;
                 }
                 resolve(this.data[storageName]);
@@ -95,11 +90,15 @@ export class Plugin {
 
     public saveData(storageName: string, data: any) {
         return new Promise((resolve) => {
-            if (!this.data) {
-                this.data = {};
-            }
             const pathString = `/data/storage/petal/${this.name}/${storageName}`;
-            const file = new File([new Blob([data])], pathString.split("/").pop());
+            let file: File;
+            if (typeof data === "object") {
+                file = new File([new Blob([JSON.stringify(data)], {
+                    type: "application/json"
+                })], pathString.split("/").pop());
+            } else {
+                file = new File([new Blob([data])], pathString.split("/").pop());
+            }
             const formData = new FormData();
             formData.append("path", pathString);
             formData.append("file", file);
diff --git a/app/src/util/fetch.ts b/app/src/util/fetch.ts
index 83194ffc8..22f43e0fc 100644
--- a/app/src/util/fetch.ts
+++ b/app/src/util/fetch.ts
@@ -48,15 +48,16 @@ export const fetchPost = (url: string, data?: any, cb?: (response: IWebSocketDat
             }
             return;
         }
-        if (typeof response.msg === "undefined") {
-            return;
-        }
         if (["/api/search/searchRefBlock", "/api/graph/getGraph", "/api/graph/getLocalGraph"].includes(url)) {
             if (response.data.reqId && window.siyuan.reqIds[url] && window.siyuan.reqIds[url] > response.data.reqId) {
                 return;
             }
         }
-        if (processMessage(response) && cb) {
+        if (typeof response === "object" && typeof response.msg === "string" && typeof response.code === "number") {
+            if (processMessage(response) && cb) {
+                cb(response);
+            }
+        } else if (cb) {
             cb(response);
         }
     }).catch((e) => {