diff --git a/api/__tests__/helper.test.ts b/api/__tests__/helper.test.ts
index f7adb2ec2..afa938eb8 100644
--- a/api/__tests__/helper.test.ts
+++ b/api/__tests__/helper.test.ts
@@ -1,4 +1,5 @@
 import 'dotenv/config'
+import * as bookcarsTypes from ':bookcars-types'
 import * as helper from '../src/common/helper'
 
 describe('Test string to boolean', () => {
@@ -47,3 +48,10 @@ describe('Test getStripeLocale', () => {
     expect(helper.getStripeLocale('')).toBe('auto')
   })
 })
+
+describe('Test validateAccessToken', () => {
+  it('should test validateAccessToken', async () => {
+    // test failure
+    expect(await helper.validateAccessToken('unknown' as bookcarsTypes.SocialSignInType, 'token', 'unknow@unknown.com')).toBeFalsy()
+  })
+})
diff --git a/api/src/common/helper.ts b/api/src/common/helper.ts
index e3ea4064f..9d1c2b1c8 100644
--- a/api/src/common/helper.ts
+++ b/api/src/common/helper.ts
@@ -226,9 +226,9 @@ export const parseJwt = (token: string) => JSON.parse(Buffer.from(token.split('.
  * Validate JWT token structure.
  *
  * @param {string} token
- * @returns {boolean}
+ * @returns {Promise<boolean>}
  */
-export const validateAccessToken = async (socialSignInType: bookcarsTypes.SocialSignInType, token: string, email: string) => {
+export const validateAccessToken = async (socialSignInType: bookcarsTypes.SocialSignInType, token: string, email: string): Promise<boolean> => {
   if (socialSignInType === bookcarsTypes.SocialSignInType.Facebook) {
     try {
       parseJwt(token)