diff --git a/server/tests/routes/detectors.test.js b/server/tests/routes/detectors.test.js
index 74959bb..227beb7 100644
--- a/server/tests/routes/detectors.test.js
+++ b/server/tests/routes/detectors.test.js
@@ -414,7 +414,8 @@ describe('Detectors Routes', () => {
 
       expect(response.status).to.equal(400);
       expect(response.body.success).to.be.false;
-      expect(response.body.error).to.include('Invalid payload');
+      expect(response.body).to.have.property('error');
+      expect(response.body.error).to.be.a('string');
     });
 
     it('should log detection data for debugging', async () => {