diff --git a/backend/SystemUpdater/UpdateManagerDbus.py b/backend/SystemUpdater/UpdateManagerDbus.py
index 22879d3..6eaa99e 100755
--- a/backend/SystemUpdater/UpdateManagerDbus.py
+++ b/backend/SystemUpdater/UpdateManagerDbus.py
@@ -77,8 +77,8 @@ class UpdateManagerDbusController(dbus.service.Object):
 
     #重启aptdeamon后台服务
     def make_aptdeamon_restart(self):
-        header = None
-        desc = None
+        header = ''
+        desc = ''
 
         try:
             obj = self.bus.get_object('org.debian.apt', '/org/debian/apt')
@@ -86,8 +86,7 @@ class UpdateManagerDbusController(dbus.service.Object):
             retval = interface.Quit()
         except Exception as e:
             header = _("aptdeamon restart occur Exception")
-            desc = str(e)
-            logging.error(header + desc)
+            logging.error(str(e))
             return False,header,desc
 
     def check_connectivity(self):