diff --git a/backend/package.json b/backend/package.json
index dff173d..6f932e6 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.14.49",
+  "version": "2.14.50",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {
diff --git a/backend/src/restful/preview.js b/backend/src/restful/preview.js
index 2c6f4e2..9e6d75d 100644
--- a/backend/src/restful/preview.js
+++ b/backend/src/restful/preview.js
@@ -12,98 +12,122 @@ export default function register($app) {
 }
 
 async function compareSub(req, res) {
-    const sub = req.body;
-    const target = req.query.target || 'JSON';
-    let content;
-    if (sub.source === 'local') {
-        content = sub.content;
-    } else {
-        try {
-            content = await download(sub.url, sub.ua);
-        } catch (err) {
-            failed(
-                res,
-                new NetworkError(
-                    'FAILED_TO_DOWNLOAD_RESOURCE',
-                    '无法下载远程资源',
-                    `Reason: ${err}`,
-                ),
-            );
-            return;
-        }
-    }
-    // parse proxies
-    const original = ProxyUtils.parse(content);
-
-    // add id
-    original.forEach((proxy, i) => {
-        proxy.id = i;
-    });
-
-    // apply processors
-    const processed = await ProxyUtils.process(
-        original,
-        sub.process || [],
-        target,
-    );
-
-    // produce
-    success(res, { original, processed });
-}
-
-async function compareCollection(req, res) {
-    const allSubs = $.read(SUBS_KEY);
-    const collection = req.body;
-    const subnames = collection.subscriptions;
-    const results = {};
-
-    await Promise.all(
-        subnames.map(async (name) => {
-            const sub = findByName(allSubs, name);
+    try {
+        const sub = req.body;
+        const target = req.query.target || 'JSON';
+        let content;
+        if (sub.source === 'local') {
+            content = sub.content;
+        } else {
             try {
-                let raw;
-                if (sub.source === 'local') {
-                    raw = sub.content;
-                } else {
-                    raw = await download(sub.url, sub.ua);
-                }
-                // parse proxies
-                let currentProxies = ProxyUtils.parse(raw);
-                // apply processors
-                currentProxies = await ProxyUtils.process(
-                    currentProxies,
-                    sub.process || [],
-                    'JSON',
-                );
-                results[name] = currentProxies;
+                content = await download(sub.url, sub.ua);
             } catch (err) {
                 failed(
                     res,
-                    new InternalServerError(
-                        'PROCESS_FAILED',
-                        `处理子订阅 ${name} 失败`,
+                    new NetworkError(
+                        'FAILED_TO_DOWNLOAD_RESOURCE',
+                        '无法下载远程资源',
                         `Reason: ${err}`,
                     ),
                 );
+                return;
             }
-        }),
-    );
+        }
+        // parse proxies
+        const original = ProxyUtils.parse(content);
 
-    // merge proxies with the original order
-    const original = Array.prototype.concat.apply(
-        [],
-        subnames.map((name) => results[name] || []),
-    );
+        // add id
+        original.forEach((proxy, i) => {
+            proxy.id = i;
+        });
 
-    original.forEach((proxy, i) => {
-        proxy.id = i;
-    });
+        // apply processors
+        const processed = await ProxyUtils.process(
+            original,
+            sub.process || [],
+            target,
+        );
 
-    const processed = await ProxyUtils.process(
-        original,
-        collection.process || [],
-        'JSON',
-    );
-
-    success(res, { original, processed });
+        // produce
+        success(res, { original, processed });
+    } catch (err) {
+        $.error(err.message ?? err);
+        failed(
+            res,
+            new InternalServerError(
+                `INTERNAL_SERVER_ERROR`,
+                `Failed to preview subscription`,
+                `Reason: ${err.message ?? err}`,
+            ),
+        );
+    }
+}
+
+async function compareCollection(req, res) {
+    try {
+        const allSubs = $.read(SUBS_KEY);
+        const collection = req.body;
+        const subnames = collection.subscriptions;
+        const results = {};
+
+        await Promise.all(
+            subnames.map(async (name) => {
+                const sub = findByName(allSubs, name);
+                try {
+                    let raw;
+                    if (sub.source === 'local') {
+                        raw = sub.content;
+                    } else {
+                        raw = await download(sub.url, sub.ua);
+                    }
+                    // parse proxies
+                    let currentProxies = ProxyUtils.parse(raw);
+                    // apply processors
+                    currentProxies = await ProxyUtils.process(
+                        currentProxies,
+                        sub.process || [],
+                        'JSON',
+                    );
+                    results[name] = currentProxies;
+                } catch (err) {
+                    failed(
+                        res,
+                        new InternalServerError(
+                            'PROCESS_FAILED',
+                            `处理子订阅 ${name} 失败`,
+                            `Reason: ${err}`,
+                        ),
+                    );
+                }
+            }),
+        );
+
+        // merge proxies with the original order
+        const original = Array.prototype.concat.apply(
+            [],
+            subnames.map((name) => results[name] || []),
+        );
+
+        original.forEach((proxy, i) => {
+            proxy.id = i;
+        });
+
+        const processed = await ProxyUtils.process(
+            original,
+            collection.process || [],
+            'JSON',
+        );
+
+        success(res, { original, processed });
+    } catch (err) {
+        $.error(err.message ?? err);
+        failed(
+            res,
+            new InternalServerError(
+                `INTERNAL_SERVER_ERROR`,
+                `Failed to preview collection`,
+                `Reason: ${err.message ?? err}`,
+            ),
+        );
+    }
 }