diff --git a/v2rayN/v2rayN/Base/SqliteHelper.cs b/v2rayN/v2rayN/Base/SqliteHelper.cs
index 4b6a2c3c..60c60811 100644
--- a/v2rayN/v2rayN/Base/SqliteHelper.cs
+++ b/v2rayN/v2rayN/Base/SqliteHelper.cs
@@ -9,8 +9,9 @@ namespace v2rayN.Base
         private static readonly Lazy<SqliteHelper> _instance = new(() => new());
         public static SqliteHelper Instance => _instance.Value;
         private string _connstr;
-        public SQLiteConnection _db;
-        public SQLiteAsyncConnection _dbAsync;
+        private SQLiteConnection _db;
+        private SQLiteAsyncConnection _dbAsync;
+        private static readonly object objLock = new();
 
         public SqliteHelper()
         {
@@ -34,7 +35,10 @@ namespace v2rayN.Base
         }
         public int Replace(object model)
         {
-            return _db.InsertOrReplace(model);
+            lock (objLock)
+            {
+                return _db.InsertOrReplace(model);
+            }
         }
         public async Task<int> Replacesync(object model)
         {
@@ -43,7 +47,10 @@ namespace v2rayN.Base
 
         public int Update(object model)
         {
-            return _db.Update(model);
+            lock (objLock)
+            {
+                return _db.Update(model);
+            }
         }
         public async Task<int> UpdateAsync(object model)
         {
@@ -51,12 +58,18 @@ namespace v2rayN.Base
         }
         public int UpdateAll(IEnumerable models)
         {
-            return _db.UpdateAll(models);
+            lock (objLock)
+            {
+                return _db.UpdateAll(models);
+            }
         }
 
         public int Delete(object model)
         {
-            return _db.Delete(model);
+            lock (objLock)
+            {
+                return _db.Delete(model);
+            }
         }
         public async Task<int> DeleteAsync(object model)
         {
diff --git a/v2rayN/v2rayN/Handler/ProfileExHandler.cs b/v2rayN/v2rayN/Handler/ProfileExHandler.cs
index b230b330..902b8817 100644
--- a/v2rayN/v2rayN/Handler/ProfileExHandler.cs
+++ b/v2rayN/v2rayN/Handler/ProfileExHandler.cs
@@ -24,7 +24,7 @@ namespace v2rayN.Handler
 
             _lstProfileEx = new(SqliteHelper.Instance.Table<ProfileExItem>());
 
-            Task.Run(async () =>
+            Task.Run(() =>
             {
                 while (true)
                 {
@@ -35,7 +35,7 @@ namespace v2rayN.Handler
                         var item = _lstProfileEx.FirstOrDefault(t => t.indexId == id);
                         if (item is not null)
                         {
-                            await SqliteHelper.Instance.Replacesync(item);
+                            SqliteHelper.Instance.Replace(item);
                         }
                     }
                     Thread.Sleep(1000 * 60);
diff --git a/v2rayN/v2rayN/Handler/StatisticsHandler.cs b/v2rayN/v2rayN/Handler/StatisticsHandler.cs
index fbd1eabc..8f95f22d 100644
--- a/v2rayN/v2rayN/Handler/StatisticsHandler.cs
+++ b/v2rayN/v2rayN/Handler/StatisticsHandler.cs
@@ -162,7 +162,7 @@ namespace v2rayN.Handler
                         todayDown = 0,
                         dateNow = ticks
                     };
-                    _ = SqliteHelper.Instance.Replacesync(_serverStatItem);
+                    SqliteHelper.Instance.Replace(_serverStatItem);
                     _lstServerStat.Add(_serverStatItem);
                 }
             }