diff --git a/Needlework.Net.Desktop/ViewModels/WebsocketViewModel.cs b/Needlework.Net.Desktop/ViewModels/WebsocketViewModel.cs
index 71d5548..69a162b 100644
--- a/Needlework.Net.Desktop/ViewModels/WebsocketViewModel.cs
+++ b/Needlework.Net.Desktop/ViewModels/WebsocketViewModel.cs
@@ -18,6 +18,8 @@ namespace Needlework.Net.Desktop.ViewModels
     public partial class WebsocketViewModel : PageBase
     {
         public ObservableCollection<string> EventLog { get; } = [];
+        public SemaphoreSlim EventLogLock { get; } = new(1, 1);
+
         [NotifyPropertyChangedFor(nameof(FilteredEventLog))]
         [ObservableProperty] private string _search = string.Empty;
         [ObservableProperty] private bool _isAttach = true;
@@ -94,25 +96,34 @@ namespace Needlework.Net.Desktop.ViewModels
 
         private void OnMessage(EventMessage message)
         {
-            Avalonia.Threading.Dispatcher.UIThread.Invoke(() =>
+            Avalonia.Threading.Dispatcher.UIThread.Invoke(async () =>
             {
                 if (!IsAttach) return;
 
                 var line = $"{DateTime.Now:HH:mm:ss.fff} {message.Data?.EventType.ToUpper()} {message.Data?.Uri}";
                 Trace.WriteLine($"Message: {line}");
-                if (EventLog.Count < 1000)
-                {
-                    EventLog.Add(line);
-                    _events[line] = message;
-                }
-                else
-                {
-                    var key = EventLog[0];
-                    EventLog.RemoveAt(0);
-                    _events.Remove(key);
 
-                    EventLog.Add(line);
-                    _events[line] = message;
+                await EventLogLock.WaitAsync();
+                try
+                {
+                    if (EventLog.Count < 1000)
+                    {
+                        EventLog.Add(line);
+                        _events[line] = message;
+                    }
+                    else
+                    {
+                        var key = EventLog[0];
+                        EventLog.RemoveAt(0);
+                        _events.Remove(key);
+
+                        EventLog.Add(line);
+                        _events[line] = message;
+                    }
+                }
+                finally
+                {
+                    EventLogLock.Release();
                 }
             });
         }
diff --git a/Needlework.Net.Desktop/Views/WebsocketView.axaml.cs b/Needlework.Net.Desktop/Views/WebsocketView.axaml.cs
index c751251..af1ec95 100644
--- a/Needlework.Net.Desktop/Views/WebsocketView.axaml.cs
+++ b/Needlework.Net.Desktop/Views/WebsocketView.axaml.cs
@@ -7,6 +7,7 @@ using CommunityToolkit.Mvvm.Messaging;
 using Needlework.Net.Desktop.Extensions;
 using Needlework.Net.Desktop.Messages;
 using Needlework.Net.Desktop.ViewModels;
+using System;
 using TextMateSharp.Grammars;
 
 namespace Needlework.Net.Desktop.Views;
@@ -14,6 +15,8 @@ namespace Needlework.Net.Desktop.Views;
 public partial class WebsocketView : UserControl, IRecipient<ResponseUpdatedMessage>
 {
     private TextEditor? _responseEditor;
+    public WebsocketViewModel? _viewModel;
+    private ListBox? _viewer;
 
     public WebsocketView()
     {
@@ -29,9 +32,9 @@ public partial class WebsocketView : UserControl, IRecipient<ResponseUpdatedMess
     {
         base.OnApplyTemplate(e);
 
-        var vm = (WebsocketViewModel)DataContext!;
-        var viewer = this.FindControl<ListBox>("EventViewer");
-        vm.EventLog.CollectionChanged += (s, e) => { if (vm.IsTail) viewer!.ScrollIntoView(vm.EventLog.Count - 1); };
+        _viewModel = (WebsocketViewModel)DataContext!;
+        _viewer = this.FindControl<ListBox>("EventViewer");
+        _viewModel.EventLog.CollectionChanged += EventLog_CollectionChanged; ;
 
         _responseEditor = this.FindControl<TextEditor>("ResponseEditor");
         _responseEditor?.ApplyJsonEditorSettings();
@@ -41,6 +44,26 @@ public partial class WebsocketView : UserControl, IRecipient<ResponseUpdatedMess
         OnBaseThemeChanged(Application.Current!.ActualThemeVariant);
     }
 
+    private void EventLog_CollectionChanged(object? sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
+    {
+        Avalonia.Threading.Dispatcher.UIThread.Post(async () =>
+        {
+            if (_viewModel!.IsTail)
+            {
+                await _viewModel.EventLogLock.WaitAsync();
+                try
+                {
+                    _viewer!.ScrollIntoView(_viewModel.EventLog.Count - 1);
+                }
+                catch (InvalidOperationException) { }
+                finally
+                {
+                    _viewModel.EventLogLock.Release();
+                }
+            }
+        });
+    }
+
     private void OnBaseThemeChanged(ThemeVariant currentTheme)
     {