diff --git a/lib/middleware/onerror.js b/lib/middleware/onerror.js
index dffbb6a3be457b..af44c84857380c 100644
--- a/lib/middleware/onerror.js
+++ b/lib/middleware/onerror.js
@@ -39,8 +39,10 @@ module.exports = async (ctx, next) => {
             });
         }
     } catch (err) {
-        if (err instanceof Error && !err.stack.split('\n')[0].includes('lib/middleware/parameter.js')) {
+        if (err instanceof Error && !err.stack.split('\n')[1].includes('lib/middleware/parameter.js')) {
             // Append v2 route path if a route throws an error
+            // since koa-mount will remove the mount path from ctx.request.path
+            // https://github.com/koajs/mount/issues/62
             ctx.request.path = (ctx.mountPath ?? '') + ctx.request.path;
             ctx._matchedRoute = ctx._matchedRoute ? (ctx.mountPath ?? '') + ctx._matchedRoute : ctx.request.path;
         }
diff --git a/test/router.js b/test/router.js
index 26bead6e58d2f8..91c1db2d1435fc 100644
--- a/test/router.js
+++ b/test/router.js
@@ -17,7 +17,7 @@ async function checkRSS(response) {
         expect(date).toEqual(expect.any(String));
         expect(Date.parse(date)).toEqual(expect.any(Number));
         expect(new Date() - new Date(date)).toBeGreaterThan(-1000 * 60 * 60 * 24 * 5);
-        expect(new Date() - new Date(date)).toBeLessThan(1000 * 60 * 60 * 24 * 30 * 12 * 5);
+        expect(new Date() - new Date(date)).toBeLessThan(1000 * 60 * 60 * 24 * 30 * 12 * 10);
     };
 
     const parsed = await parser.parseString(response.text);