diff --git a/app/controller/OAuthController.php b/app/controller/OAuthController.php
index 4768a88..3a0930d 100644
--- a/app/controller/OAuthController.php
+++ b/app/controller/OAuthController.php
@@ -44,8 +44,12 @@ class OAuthController
         $googleOAuthService = new GoogleOAuthService();
 
         $tokens = $googleOAuthService->getRefreshToken($code);
+
         if (!isset($tokens['refresh_token'])) {
-            return $this->errorResponse(300, 'Invalid state parameter');
+            if (isset($tokens['access_token'])) {
+                return $this->errorResponse(300, 'Google Ads Account is Authorized');
+            }
+            return $this->errorResponse(300, 'Refresh Token getting failed');
         } else {
             $googleOAuthService->saveRefreshToken($tokens['refresh_token'], $state);
         }