diff --git a/test/unit/web/shared/middleware/custom-redirects.test.js b/test/unit/web/shared/middleware/custom-redirects.test.js
index 6ed5fbdacf..65d9a9bafa 100644
--- a/test/unit/web/shared/middleware/custom-redirects.test.js
+++ b/test/unit/web/shared/middleware/custom-redirects.test.js
@@ -5,6 +5,7 @@ const express = require('express');
 
 const customRedirects = rewire('../../../../../core/server/web/shared/middlewares/custom-redirects');
 const registerRoutes = customRedirects.__get__('_private.registerRoutes');
+const supertest = require('supertest');
 
 describe('UNIT: custom redirects', function () {
     let res;
@@ -17,7 +18,8 @@ describe('UNIT: custom redirects', function () {
         };
         res = {
             redirect: sinon.spy(),
-            set: sinon.spy()
+            set: sinon.spy(),
+            writeHead: sinon.spy()
         };
 
         next = sinon.spy();
@@ -46,4 +48,22 @@ describe('UNIT: custom redirects', function () {
             'Cache-Control': `public, max-age=0`
         });
     });
+
+    it('the parent app functions even when the middleware gets an invalid redirects configuration', function (done) {
+        const redirectsConfig = [{
+            permanent: true,
+            from: '/invalid_regex/(/size/[a-zA-Z0-9_-.]*/[a-zA-Z0-9_-.]*/[0-9]*/[0-9]*/)([a-zA-Z0-9_-.]*)',
+            to: '/'
+        }];
+        const redirectsService = customRedirects.__get__('redirectsService');
+        sinon.stub(redirectsService, 'loadRedirectsFile').returns(redirectsConfig);
+
+        const app = express('test');
+        customRedirects.use(app);
+        app.get('/', (_req, _res) => _res.status(200).end());
+
+        supertest(app)
+            .get('/')
+            .expect(200, done);
+    });
 });