diff --git a/backend/package.json b/backend/package.json
index a7aee34..28097dc 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.14.29",
+  "version": "2.14.30",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {
diff --git a/backend/src/restful/download.js b/backend/src/restful/download.js
index a369084..0bdc2e3 100644
--- a/backend/src/restful/download.js
+++ b/backend/src/restful/download.js
@@ -32,10 +32,18 @@ async function downloadSubscription(req, res) {
             });
 
             if (sub.source !== 'local') {
-                // forward flow headers
-                const flowInfo = await getFlowHeaders(sub.url);
-                if (flowInfo) {
-                    res.set('subscription-userinfo', flowInfo);
+                try {
+                    // forward flow headers
+                    const flowInfo = await getFlowHeaders(sub.url);
+                    if (flowInfo) {
+                        res.set('subscription-userinfo', flowInfo);
+                    }
+                } catch (err) {
+                    $.error(
+                        `订阅 ${name} 获取流量信息时发生错误: ${JSON.stringify(
+                            err,
+                        )}`,
+                    );
                 }
             }
 
@@ -50,15 +58,15 @@ async function downloadSubscription(req, res) {
             $.notify(
                 `🌍 Sub-Store 下载订阅失败`,
                 `❌ 无法下载订阅：${name}！`,
-                `🤔 原因：${JSON.stringify(err)}`,
+                `🤔 原因：${err.message ?? err}`,
             );
-            $.error(JSON.stringify(err));
+            $.error(err.message ?? err);
             failed(
                 res,
                 new InternalServerError(
                     'INTERNAL_SERVER_ERROR',
                     `Failed to download subscription: ${name}`,
-                    `Reason: ${JSON.stringify(err)}`,
+                    `Reason: ${err.message ?? err}`,
                 ),
             );
         }
@@ -101,9 +109,17 @@ async function downloadCollection(req, res) {
             if (subnames.length > 0) {
                 const sub = findByName(allSubs, subnames[0]);
                 if (sub.source !== 'local') {
-                    const flowInfo = await getFlowHeaders(sub.url);
-                    if (flowInfo) {
-                        res.set('subscription-userinfo', flowInfo);
+                    try {
+                        const flowInfo = await getFlowHeaders(sub.url);
+                        if (flowInfo) {
+                            res.set('subscription-userinfo', flowInfo);
+                        }
+                    } catch (err) {
+                        $.error(
+                            `组合订阅 ${name} 中的子订阅 ${
+                                sub.name
+                            } 获取流量信息时发生错误: ${err.message ?? err}`,
+                        );
                     }
                 }
             }
@@ -126,7 +142,7 @@ async function downloadCollection(req, res) {
                 new InternalServerError(
                     'INTERNAL_SERVER_ERROR',
                     `Failed to download collection: ${name}`,
-                    `Reason: ${JSON.stringify(err)}`,
+                    `Reason: ${err.message ?? err}`,
                 ),
             );
         }
diff --git a/backend/src/restful/miscs.js b/backend/src/restful/miscs.js
index b03e146..e4f6af1 100644
--- a/backend/src/restful/miscs.js
+++ b/backend/src/restful/miscs.js
@@ -136,7 +136,7 @@ async function gistBackup(req, res) {
                 new InternalServerError(
                     'BACKUP_FAILED',
                     `Failed to ${action} data to gist!`,
-                    `Reason: ${JSON.stringify(err)}`,
+                    `Reason: ${err.message ?? err}`,
                 ),
             );
         }
diff --git a/backend/src/restful/sync.js b/backend/src/restful/sync.js
index fc88bc1..54b5140 100644
--- a/backend/src/restful/sync.js
+++ b/backend/src/restful/sync.js
@@ -42,6 +42,9 @@ async function produceArtifact({ type, name, platform }) {
             sub.process || [],
             platform,
         );
+        if (proxies.length === 0) {
+            throw new Error(`订阅 ${name} 中不含有效节点`);
+        }
         // check duplicate
         const exist = {};
         for (const proxy of proxies) {
@@ -67,6 +70,7 @@ async function produceArtifact({ type, name, platform }) {
         const collection = findByName(allCols, name);
         const subnames = collection.subscriptions;
         const results = {};
+        const errors = {};
         let processed = 0;
 
         await Promise.all(
@@ -97,6 +101,7 @@ async function produceArtifact({ type, name, platform }) {
                     );
                 } catch (err) {
                     processed++;
+                    errors[name] = err;
                     $.error(
                         `❌ 处理组合订阅中的子订阅: ${
                             sub.name
@@ -108,10 +113,18 @@ async function produceArtifact({ type, name, platform }) {
             }),
         );
 
+        if (Object.keys(errors).length > 0) {
+            throw new Error(
+                `组合订阅 ${name} 中的子订阅 ${Object.keys(errors).join(
+                    ', ',
+                )} 发生错误, 请查看日志`,
+            );
+        }
+
         // merge proxies with the original order
         let proxies = Array.prototype.concat.apply(
             [],
-            subnames.map((name) => results[name]),
+            subnames.map((name) => results[name] || []),
         );
 
         // apply own processors
@@ -121,7 +134,7 @@ async function produceArtifact({ type, name, platform }) {
             platform,
         );
         if (proxies.length === 0) {
-            throw new Error(`组合订阅中不含有效节点！`);
+            throw new Error(`组合订阅 ${name} 中不含有效节点`);
         }
         // check duplicate
         const exist = {};