diff --git a/lib/middleware/cache/index.js b/lib/middleware/cache/index.js
index 05bf29a2e8..52c0b3aeaa 100644
--- a/lib/middleware/cache/index.js
+++ b/lib/middleware/cache/index.js
@@ -56,6 +56,9 @@ module.exports = function (app) {
     app.context.cache = {
         ...cacheModule,
         tryGet: async (key, getValueFunc, maxAge = config.cache.contentExpire, refresh = true) => {
+            if (typeof key !== 'string') {
+                throw Error('Cache key must be a string');
+            }
             let v = await get(key, refresh);
             if (!v) {
                 v = await getValueFunc();
diff --git a/lib/v2/test/index.js b/lib/v2/test/index.js
index 38ebf88ca9..91741841fa 100644
--- a/lib/v2/test/index.js
+++ b/lib/v2/test/index.js
@@ -75,6 +75,21 @@ module.exports = async (ctx) => {
             link: `https://github.com/DIYgod/RSSHub/issues/0`,
             author: `DIYgod0`,
         });
+    } else if (ctx.params.id === 'cacheUrlKey') {
+        const description = await ctx.cache.tryGet(
+            new URL('https://rsshub.app'),
+            () => ({
+                text: `Cache${++cacheIndex}`,
+            }),
+            config.cache.routeExpire * 2
+        );
+        item.push({
+            title: 'Cache Title',
+            description: description.text,
+            pubDate: new Date(`2019-3-1`).toUTCString(),
+            link: `https://github.com/DIYgod/RSSHub/issues/0`,
+            author: `DIYgod0`,
+        });
     } else if (ctx.params.id === 'complicated') {
         item.push({
             title: `Complicated Title`,
diff --git a/test/middleware/cache.js b/test/middleware/cache.js
index bae584f079..88a138ba66 100644
--- a/test/middleware/cache.js
+++ b/test/middleware/cache.js
@@ -190,4 +190,17 @@ describe('cache', () => {
         expect(parsed1.items[0].content).toBe('Cache1');
         expect(parsed2.items[0].content).toBe('Cache2');
     });
+
+    it('throws URL key', async () => {
+        process.env.CACHE_TYPE = 'memory';
+        server = require('../../lib/index');
+        const request = supertest(server);
+
+        try {
+            const response = await request.get('/test/cacheUrlKey');
+            expect(response).toThrow(Error);
+        } catch (e) {
+            expect(e.message).toContain('Cache key must be a string');
+        }
+    });
 });