diff --git a/SCP/default.aspx.cs b/SCP/default.aspx.cs
index d248a03..23fe939 100644
--- a/SCP/default.aspx.cs
+++ b/SCP/default.aspx.cs
@@ -117,6 +117,11 @@ namespace SCP
                 return;
             }
             User user = DB.Users.Where(u => u.Name == p_userName).FirstOrDefault();
+            if (user == null)
+            {
+                Alert.Show(GetResourceKey("用户名或密码错误！"));
+                return;
+            }
             if (!user.Enabled)
             {
                 Alert.Show(GetResourceKey("用户未启用或已锁定，请联系管理员！"));