diff --git a/v2rayN/v2rayN/Forms/GroupSettingForm.cs b/v2rayN/v2rayN/Forms/GroupSettingForm.cs
index 0b0d3e4c..7856256c 100644
--- a/v2rayN/v2rayN/Forms/GroupSettingForm.cs
+++ b/v2rayN/v2rayN/Forms/GroupSettingForm.cs
@@ -66,12 +66,7 @@ namespace v2rayN.Forms
         }
 
         private void btnOK_Click(object sender, EventArgs e)
-        {
-            if (config.groupItem.Count <= 0)
-            {
-                AddGroup();
-            }
-
+        {            
             if (ConfigHandler.SaveGroupItem(ref config) == 0)
             {
                 this.DialogResult = DialogResult.OK;
diff --git a/v2rayN/v2rayN/Forms/MainForm.cs b/v2rayN/v2rayN/Forms/MainForm.cs
index 78f1d58c..85f43a9a 100644
--- a/v2rayN/v2rayN/Forms/MainForm.cs
+++ b/v2rayN/v2rayN/Forms/MainForm.cs
@@ -82,7 +82,7 @@ namespace v2rayN.Forms
             RefreshRoutingsMenu();
             RestoreUI();
 
-            LoadV2ray();
+            _ = LoadV2ray();
 
             HideForm();
 
@@ -602,7 +602,7 @@ namespace v2rayN.Forms
             if (fm.ShowDialog() == DialogResult.OK)
             {
                 RefreshServers();
-                LoadV2ray();
+                _ = LoadV2ray();
             }
         }
 
@@ -691,7 +691,7 @@ namespace v2rayN.Forms
             ConfigHandler.RemoveServer(config, lvSelecteds);
 
             RefreshServers();
-            LoadV2ray();
+            _ = LoadV2ray();
         }
 
         private void menuRemoveDuplicateServer_Click(object sender, EventArgs e)
@@ -700,7 +700,7 @@ namespace v2rayN.Forms
             ConfigHandler.DedupServerList(ref config, ref lstVmess);
             int newCount = lstVmess.Count;
             RefreshServers();
-            LoadV2ray();
+            _ = LoadV2ray();
             UI.Show(string.Format(UIRes.I18N("RemoveDuplicateServerResult"), oldCount, newCount));
         }
 
@@ -847,7 +847,7 @@ namespace v2rayN.Forms
             if (fm.ShowDialog() == DialogResult.OK)
             {
                 RefreshServers();
-                LoadV2ray();
+                _ = LoadV2ray();
             }
         }
 
@@ -858,7 +858,7 @@ namespace v2rayN.Forms
             {
                 RefreshRoutingsMenu();
                 RefreshServers();
-                LoadV2ray();
+                _ = LoadV2ray();
             }
         }
 
@@ -869,7 +869,7 @@ namespace v2rayN.Forms
             {
                 RefreshRoutingsMenu();
                 RefreshServers();
-                LoadV2ray();
+                _ = LoadV2ray();
             }
 
         }
@@ -888,7 +888,7 @@ namespace v2rayN.Forms
         private void tsbReload_Click(object sender, EventArgs e)
         {
             Global.reloadV2ray = true;
-            LoadV2ray();
+            _ = LoadV2ray();
         }
 
         private void tsbClose_Click(object sender, EventArgs e)
@@ -913,7 +913,7 @@ namespace v2rayN.Forms
             if (ConfigHandler.SetDefaultServer(ref config, lstVmess[index]) == 0)
             {
                 RefreshServers();
-                LoadV2ray();
+                _ = LoadV2ray();
             }
             return 0;
         }
@@ -1267,7 +1267,7 @@ namespace v2rayN.Forms
             if (success)
             {
                 Global.reloadV2ray = true;
-                LoadV2ray();
+                _ = LoadV2ray();
             }
         }
         #endregion
@@ -1396,7 +1396,7 @@ namespace v2rayN.Forms
                     AppendText(false, UIRes.I18N("MsgUpdateV2rayCoreSuccessfullyMore"));
 
                     Global.reloadV2ray = true;
-                    LoadV2ray();
+                    _ = LoadV2ray();
 
                     AppendText(false, UIRes.I18N("MsgUpdateV2rayCoreSuccessfully"));
                 }
@@ -1412,7 +1412,7 @@ namespace v2rayN.Forms
                 if (success)
                 {
                     Global.reloadV2ray = true;
-                    LoadV2ray();
+                    _ = LoadV2ray();
                 }
             });
         }
@@ -1425,7 +1425,7 @@ namespace v2rayN.Forms
                 if (success)
                 {
                     Global.reloadV2ray = true;
-                    LoadV2ray();
+                    _ = LoadV2ray();
                 }
             });
         }
@@ -1576,7 +1576,7 @@ namespace v2rayN.Forms
                 if (ConfigHandler.SetDefaultRouting(ref config, index) == 0)
                 {
                     RefreshRoutingsMenu();
-                    LoadV2ray();
+                    _ = LoadV2ray();
                 }
             }
             catch
diff --git a/v2rayN/v2rayN/Forms/SubSettingForm.cs b/v2rayN/v2rayN/Forms/SubSettingForm.cs
index c8e7725b..e7ba4dd3 100644
--- a/v2rayN/v2rayN/Forms/SubSettingForm.cs
+++ b/v2rayN/v2rayN/Forms/SubSettingForm.cs
@@ -68,11 +68,6 @@ namespace v2rayN.Forms
 
         private void btnOK_Click(object sender, EventArgs e)
         {
-            if (config.subItem.Count <= 0)
-            {
-                AddSub();
-            }
-
             if (ConfigHandler.SaveSubItem(ref config) == 0)
             {
                 this.DialogResult = DialogResult.OK;
diff --git a/v2rayN/v2rayN/Handler/ConfigHandler.cs b/v2rayN/v2rayN/Handler/ConfigHandler.cs
index 42d78b9b..3547a9b3 100644
--- a/v2rayN/v2rayN/Handler/ConfigHandler.cs
+++ b/v2rayN/v2rayN/Handler/ConfigHandler.cs
@@ -764,7 +764,7 @@ namespace v2rayN.Handler
         /// <returns></returns>
         public static int SaveSubItem(ref Config config)
         {
-            if (config.subItem == null || config.subItem.Count <= 0)
+            if (config.subItem == null)
             {
                 return -1;
             }
@@ -926,7 +926,7 @@ namespace v2rayN.Handler
             }
             if (!config.vmess.Exists(it => it.indexId == vmessItem.indexId))
             {
-                var maxSort = config.vmess.Max(t => t.sort);
+                var maxSort = config.vmess.Any() ? config.vmess.Max(t => t.sort) : 0;
                 vmessItem.sort = maxSort++;
 
                 config.vmess.Add(vmessItem);
@@ -970,7 +970,7 @@ namespace v2rayN.Handler
         /// <returns></returns>
         public static int SaveGroupItem(ref Config config)
         {
-            if (config.groupItem == null || config.groupItem.Count <= 0)
+            if (config.groupItem == null)
             {
                 return -1;
             }
@@ -989,12 +989,13 @@ namespace v2rayN.Handler
 
         public static int RemoveGroupItem(ref Config config, string groupId)
         {
-            if (Utils.IsNullOrEmpty(groupId) || config.vmess.Count <= 0)
+            if (Utils.IsNullOrEmpty(groupId))
             {
                 return -1;
             }
 
-            foreach (var item in config.vmess)
+            var items = config.vmess.Where(t => t.groupId == groupId).ToList();
+            foreach (var item in items)
             {
                 if (item.groupId.Equals(groupId))
                 {
diff --git a/v2rayN/v2rayN/Handler/UpdateHandle.cs b/v2rayN/v2rayN/Handler/UpdateHandle.cs
index 5688b797..ccbd3ecd 100644
--- a/v2rayN/v2rayN/Handler/UpdateHandle.cs
+++ b/v2rayN/v2rayN/Handler/UpdateHandle.cs
@@ -6,6 +6,7 @@ using System.Net.Http;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Windows.Forms;
+using v2rayN.Base;
 using v2rayN.Mode;
 
 namespace v2rayN.Handler
@@ -177,10 +178,10 @@ namespace v2rayN.Handler
 
             for (int k = 1; k <= config.subItem.Count; k++)
             {
-                string id = config.subItem[k - 1].id.Trim();
-                string url = config.subItem[k - 1].url.Trim();
-                string userAgent = config.subItem[k - 1].userAgent.Trim();
-                string groupId = config.subItem[k - 1].groupId.Trim();
+                string id = config.subItem[k - 1].id.TrimEx();
+                string url = config.subItem[k - 1].url.TrimEx();
+                string userAgent = config.subItem[k - 1].userAgent.TrimEx();
+                string groupId = config.subItem[k - 1].groupId.TrimEx();
                 string hashCode = $"{k}->";
                 if (config.subItem[k - 1].enabled == false)
                 {
diff --git a/v2rayN/v2rayN/Mode/Config.cs b/v2rayN/v2rayN/Mode/Config.cs
index 4f146871..53846f65 100644
--- a/v2rayN/v2rayN/Mode/Config.cs
+++ b/v2rayN/v2rayN/Mode/Config.cs
@@ -569,7 +569,7 @@ namespace v2rayN.Mode
         public string groupId
         {
             get; set;
-        }
+        } = string.Empty;
     }
 
     [Serializable]
@@ -703,7 +703,7 @@ namespace v2rayN.Mode
         public string groupId
         {
             get; set;
-        }
+        } = string.Empty;
     }
 
     [Serializable]