fix(core): throw URL cache key (#10497)

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();