diff --git a/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.js b/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.js
index 71aaba72..a34e9a67 100644
--- a/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.js
+++ b/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.js
@@ -2,10 +2,8 @@ import { renderObject } from '../../../../../helpers/renderer.js';
 import AppAuthClient from '../../../../../models/app-auth-client.js';
 
 export default async (request, response) => {
-  const id = request.params.appAuthClientId;
-
   const appAuthClient = await AppAuthClient.query()
-    .findById(id)
+    .findById(request.params.appAuthClientId)
     .throwIfNotFound();
 
   await appAuthClient.$query().patchAndFetch(appAuthClientParams(request));
diff --git a/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.test.js b/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.test.js
index c3a3e94d..2284bde0 100644
--- a/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.test.js
+++ b/packages/backend/src/controllers/api/v1/admin/apps/update-auth-client.ee.test.js
@@ -77,4 +77,28 @@ describe('PATCH /api/v1/admin/apps/:appKey/auth-clients', () => {
       .set('Authorization', token)
       .expect(400);
   });
+
+  it('should return HTTP 422 for invalid payload', async () => {
+    const appAuthClient = {
+      formattedAuthDefaults: 'invalid input',
+    };
+
+    const existingAppAuthClient = await createAppAuthClient({
+      appKey: 'gitlab',
+      name: 'First auth client',
+    });
+
+    const response = await request(app)
+      .patch(
+        `/api/v1/admin/apps/gitlab/auth-clients/${existingAppAuthClient.id}`
+      )
+      .set('Authorization', token)
+      .send(appAuthClient)
+      .expect(422);
+
+    expect(response.body.meta.type).toBe('ModelValidation');
+    expect(response.body.errors).toMatchObject({
+      formattedAuthDefaults: ['must be object'],
+    });
+  });
 });