diff --git a/lib/routes/zsxq/group.ts b/lib/routes/zsxq/group.ts
index eeaaa462cd..a28381444b 100644
--- a/lib/routes/zsxq/group.ts
+++ b/lib/routes/zsxq/group.ts
@@ -3,6 +3,7 @@ import type { Context } from 'hono';
 import { config } from '@/config';
 import ConfigNotFoundError from '@/errors/types/config-not-found';
 import type { Data, Route } from '@/types';
+import { getRouteLimit } from '@/utils/route-limit';
 
 import type { GroupInfoResponse, TopicsResponse } from './types';
 import { customFetch, generateTopicDataItem } from './utils';
@@ -46,10 +47,7 @@ async function handler(ctx: Context): Promise<Data> {
         throw new ConfigNotFoundError('该 RSS 源由于配置不正确而被禁用：令牌丢失。');
     }
 
-    let count = Number(ctx.req.query('limit')) || 20;
-    if (count > 30) {
-        count = 30;
-    }
+    const count = Math.min(getRouteLimit(ctx, 20), 30);
 
     const { group } = await customFetch<GroupInfoResponse>(`/groups/${groupId}`);
 
diff --git a/lib/routes/zsxq/user.ts b/lib/routes/zsxq/user.ts
index aa4eb0bd1a..d0e520559b 100644
--- a/lib/routes/zsxq/user.ts
+++ b/lib/routes/zsxq/user.ts
@@ -3,6 +3,7 @@ import type { Context } from 'hono';
 import { config } from '@/config';
 import ConfigNotFoundError from '@/errors/types/config-not-found';
 import type { Data, Route } from '@/types';
+import { getRouteLimit } from '@/utils/route-limit';
 
 import type { TopicsResponse, UserInfoResponse } from './types';
 import { customFetch, generateTopicDataItem } from './utils';
@@ -41,10 +42,7 @@ async function handler(ctx: Context): Promise<Data> {
         throw new ConfigNotFoundError('该 RSS 源由于配置不正确而被禁用：令牌丢失。');
     }
 
-    let count = Number(ctx.req.query('limit')) || 20;
-    if (count > 30) {
-        count = 30;
-    }
+    const count = Math.min(getRouteLimit(ctx, 20), 30);
 
     const userInfo = await customFetch<UserInfoResponse>(`/users/${uid}`);
 
diff --git a/lib/routes/zsxq/utils.ts b/lib/routes/zsxq/utils.ts
index 42ca2f829e..25531aeabf 100644
--- a/lib/routes/zsxq/utils.ts
+++ b/lib/routes/zsxq/utils.ts
@@ -1,3 +1,5 @@
+import { html } from 'hono/html';
+
 import { config } from '@/config';
 import type { DataItem } from '@/types';
 import got from '@/utils/got';
@@ -21,53 +23,81 @@ export async function customFetch<T extends BasicResponse<ResponseData>>(path: s
     if (code === 1059 && retryCount < 3) {
         return customFetch(path, retryCount + 1);
     }
-    throw new Error('something wrong');
+    throw new Error(`Knowledge Planet API request failed (code ${code ?? 'unknown'}). Check the access token and permission for this group or user.`);
+}
+
+function decodeTopicText(text: string) {
+    try {
+        return decodeURIComponent(text);
+    } catch {
+        return text;
+    }
+}
+
+function renderTopicLink(href: string, title: string) {
+    const label = decodeTopicText(title);
+    try {
+        const url = new URL(decodeTopicText(href));
+        if (url.protocol === 'https:' || url.protocol === 'http:') {
+            return String(html`<a href="${url.href}">${label}</a>`);
+        }
+    } catch {
+        // Malformed encoded links retain their readable label.
+    }
+    return String(html`${label}`);
 }
 
 function parseTopicContent(text: string = '', images: TopicImage[] = []) {
     let result = text.replaceAll('\n', '<br>');
-    result = result.replaceAll(/<e type="web" href="(.*?)" title="(.*?)" style="(.*?)" \/>/g, (_, p1, p2) => `<a href=${decodeURIComponent(p1)}>${decodeURIComponent(p2)}</a>`);
-    result = result.replaceAll(/<e type="hashtag".*?title="(.*?)" \/>/g, (_, p1) => {
-        const title = decodeURIComponent(p1);
-        return `<span>${title}</span>`;
-    });
-    result += images.map((image) => `<img src="${image.original?.url ?? image.large?.url ?? image.thumbnail?.url}">`).join('<br>');
+    result = result.replaceAll(/<e type="web" href="(.*?)" title="(.*?)" style="(.*?)" \/>/g, (_, href, title) => renderTopicLink(href, title));
+    result = result.replaceAll(/<e type="hashtag".*?title="(.*?)" \/>/g, (_, title) => String(html`<span>${decodeTopicText(title)}</span>`));
+    result += images
+        .map((image) => {
+            const url = image.original?.url ?? image.large?.url ?? image.thumbnail?.url;
+            return url ? String(html`<img src="${url}" />`) : '';
+        })
+        .filter(Boolean)
+        .join('<br>');
     return result;
 }
 
 export function generateTopicDataItem(topics: Topic[]): DataItem[] {
     return topics.map((topic) => {
+        if (topic.topic_id === undefined || topic.topic_id === null) {
+            throw new Error('Missing Knowledge Planet topic ID; no unique article URL is available.');
+        }
         let description: string | undefined;
         let title = '';
         const url = `https://wx.zsxq.com/topic/${topic.topic_id}`;
         switch (topic.type) {
             case 'talk':
-                title = topic.talk?.text?.split('\n', 1)[0] ?? '文章';
+                title = topic.talk?.text ?? '文章';
                 description = parseTopicContent(topic.talk?.text, topic.talk?.images);
                 break;
             case 'q&a':
-                title = topic.question?.text?.split('\n', 1)[0] ?? '问答';
+                title = topic.question?.text ?? '问答';
                 description = parseTopicContent(topic.question?.text, topic.question?.images);
-                description = `<blockquote>${topic.question?.owner?.name ?? '匿名用户'} 提问：${description}</blockquote>`;
+                description = `<blockquote>${String(html`${topic.question?.owner?.name ?? '匿名用户'}`)} 提问：${description}</blockquote>`;
                 if (topic.answered) {
-                    description += '<br>' + topic.answer?.owner.name + ' 回答：<br><br>';
+                    description += '<br>' + String(html`${topic.answer?.owner?.name ?? '匿名用户'}`) + ' 回答：<br><br>';
                     description += parseTopicContent(topic.answer?.text, topic.answer?.images);
                 }
                 break;
             case 'task':
-                title = topic.task?.text?.split('\n', 1)[0] ?? '作业';
+                title = topic.task?.text ?? '作业';
                 description = parseTopicContent(topic.task?.text, topic.task?.images);
                 break;
             case 'solution':
-                title = topic.solution?.text?.split('\n', 1)[0] ?? '写作业';
+                title = topic.solution?.text ?? '写作业';
                 description = parseTopicContent(topic.solution?.text, topic.solution?.images);
                 break;
             default:
+                throw new Error('Unsupported Knowledge Planet topic type; update RSSHub or report this topic format.');
         }
         return {
             title: topic.title ?? title,
             description,
-            pubDate: parseDate(topic.create_time),
+            pubDate: topic.create_time ? parseDate(topic.create_time) : undefined,
             link: url,
         };
     });