diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9330e96..f006237 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 [How to upgrade to the latest version!](https://unicorn-binance-rest-api.docs.lucit.tech/readme.html#installation-and-upgrade)
 
 ## 2.5.1.dev (development stage/unreleased/unstable)
+### Fixed
+- `_save_used_weight()` - Exception: int() argument must be a string, a bytes-like object or a real number, not 'NoneType'
 
 ## 2.5.1
 ### Changed
diff --git a/unicorn_binance_rest_api/manager.py b/unicorn_binance_rest_api/manager.py
index f2b089f..306ecdd 100644
--- a/unicorn_binance_rest_api/manager.py
+++ b/unicorn_binance_rest_api/manager.py
@@ -607,12 +607,15 @@ def _request_futures_coin_data_api(self, method, path, signed=False, version=1,
 
     def _save_used_weight(self) -> bool:
         try:
+            weight = self.response.headers.get('X-MBX-USED-WEIGHT')
+            if weight is None:
+                return False
             self.used_weight = {'status_code': int(self.response.status_code),
                                 'timestamp': datetime.datetime.strptime(self.response.headers.get('Date'),
                                                                         "%a, %d %b %Y %H:%M:%S GMT").timestamp(),
-                                'weight': int(self.response.headers.get('X-MBX-USED-WEIGHT'))}
+                                'weight': int(weight)}
         except Exception as error_msg:
-            logger.debug(f"BinanceRestApiManager.stop_manager() - Exception: {error_msg}")
+            logger.debug(f"BinanceRestApiManager._save_used_weight() - Exception: {error_msg}")
             return False
         return True
 
@@ -7225,8 +7228,7 @@ def stop_manager(self, close_api_session=True):
         """
         Stop the BinanceRestApiManager
         """
-        logger.info("BinanceRestApiManager.stop_manager() - Stopping "
-                    "unicorn_binance_rest_api_manager " + self.version + " ...")
+        logger.info(f"BinanceRestApiManager.stop_manager() - Stopping ...")
         self.sigterm = True
         # close the request session
         try: