diff --git a/libs/custom/syno/auth.py b/libs/custom/syno/auth.py
index 2c089a77..6cef3c59 100644
--- a/libs/custom/syno/auth.py
+++ b/libs/custom/syno/auth.py
@@ -12,12 +12,11 @@ class Authentication:
         self._base_url = 'http://%s:%s/webapi/' % (self._ip_address, self._port)
 
         self.full_api_list = {}
-        self.app_api_list = {}
 
     def login(self, application):
         self.get_api_list('SYNO.API.Auth')
         login_api = 'auth.cgi?api=SYNO.API.Auth'
-        param = {'version': self.app_api_list['SYNO.API.Auth']['maxVersion'], 'method': 'login', 'account': self._username,
+        param = {'version': self.full_api_list['SYNO.API.Auth']['maxVersion'], 'method': 'login', 'account': self._username,
                  'passwd': self._password, 'session': application, 'format': 'cookie'}
 
         if not self._session_expire:
@@ -32,7 +31,7 @@ class Authentication:
 
     def logout(self, application):
         logout_api = 'auth.cgi?api=SYNO.API.Auth'
-        param = {'version': self.app_api_list['SYNO.API.Auth']['maxVersion'], 'method': 'logout', 'session': application}
+        param = {'version': self.full_api_list['SYNO.API.Auth']['maxVersion'], 'method': 'logout', 'session': application}
 
         response = requests.get(self._base_url + logout_api, param)
         if response.json()['success'] is True:
@@ -53,7 +52,7 @@ class Authentication:
         if app is not None:
             for key in response['data']:
                 if app.lower() in key.lower():
-                    self.app_api_list[key] = response['data'][key]
+                    self.full_api_list[key] = response['data'][key]
         else:
             self.full_api_list = response['data']