diff --git a/bot.py b/bot.py
index b2987a4..3b68270 100644
--- a/bot.py
+++ b/bot.py
@@ -30,6 +30,7 @@ class Bot:
         api_key: Optional[str] = "",
         room_id: Optional[str] = '',
         bing_api_endpoint: Optional[str] = '',
+        access_token: Optional[str] = '',
     ):
         self.homeserver = homeserver
         self.user_id = user_id
@@ -46,6 +47,8 @@ class Bot:
                                         )
         self.client = AsyncClient(self.homeserver, user=self.user_id, device_id=self.device_id,
                                   config=self.config, store_path=self.store_path)
+        if access_token != '':
+            self.client.access_token = access_token
         # regular expression to match keyword [!gpt {prompt}] [!chat {prompt}]
         self.gpt_prog = re.compile(r"^\s*!gpt\s*(.+)$")
         self.chat_prog = re.compile(r"^\s*!chat\s*(.+)$")
@@ -138,10 +141,14 @@ class Bot:
 
     # bot login
     async def login(self) -> None:
-        resp = await self.client.login(password=self.password)
-        if not isinstance(resp, LoginResponse):
-            print(f"Login Failed: {resp}")
-            sys.exit(1)
+        try:
+            resp = await self.client.login(password=self.password)
+            if not isinstance(resp, LoginResponse):
+                logger.error("Login Failed")
+                print(f"Login Failed: {resp}")
+                sys.exit(1)
+        except Exception as e:
+            logger.error("Error Exception", exc_info=True)
 
     # sync messages in the room
     async def sync_forever(self, timeout=30000):
diff --git a/config.json.sample b/config.json.sample
index d8ade41..04ea8fb 100644
--- a/config.json.sample
+++ b/config.json.sample
@@ -5,5 +5,5 @@
   "device_id": "ECYEOKVPLG",
   "room_id": "!FYCmBSkCRUNvZDBaDQ:matrix.qqs.tw",
   "api_key": "xxxxxxxxxxxxxxxxxxxxxxxx",
-  "bing_api_endpoint": ""
+  "access_token": "xxxxxxx"
 }
\ No newline at end of file
diff --git a/main.py b/main.py
index 056c131..0534555 100644
--- a/main.py
+++ b/main.py
@@ -9,13 +9,15 @@ async def main():
     config = json.load(fp)
     matrix_bot = Bot(homeserver=config['homeserver'],
                      user_id=config['user_id'],
-                     password=config['password'],
+                     password=config.get('password', ''),
                      device_id=config['device_id'],
                      room_id=config.get('room_id', ''),  # provide a default value when the key does not exist
                      api_key=config.get('api_key', ''),
                      bing_api_endpoint=config.get('bing_api_endpoint', ''),
+                     access_token=config.get('access_token', '')
                      )
-    await matrix_bot.login()
+    if config.get('access_token', '') == '':
+        await matrix_bot.login()
     await matrix_bot.sync_forever()