Update app.py

app.py

@@ -253,7 +253,7 @@ def get_valid_tokens():
                 "client_secret": CLIENT_SECRET
             }
             res_data = fetch_token_from_api(payload)
-            if res_data:
+            if res_data and "accessToken" in res_data:
                 tokens["access_token"] = res_data["accessToken"]
                 tokens["refresh_token"] = res_data["refreshToken"]
                 tokens["updated_at"] = time.time()
@@ -262,6 +262,8 @@ def get_valid_tokens():
                     tokens["account_id"] = str(res_data["accounts"][0]["ctidTraderAccountId"])
                 save_tokens(tokens)
                 return tokens
+            else:
+                logger.error(f"Failed to refresh token: {res_data}")
             
     # Return existing tokens if still fresh/valid
     if access_token: