diff --git a/SmartTaskbar/Program.cs b/SmartTaskbar/Program.cs
index b78cdd5..347e730 100644
--- a/SmartTaskbar/Program.cs
+++ b/SmartTaskbar/Program.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Windows.Forms;
 
 namespace SmartTaskbar
@@ -11,6 +12,8 @@ static class Program
         [STAThread]
         static void Main()
         {
+            if (Process.GetProcessesByName(Process.GetCurrentProcess().ProcessName).Length > 1)
+                return;
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
             new SystemTray();
diff --git a/SmartTaskbar/SystemTray.cs b/SmartTaskbar/SystemTray.cs
index 790098c..86ce6f3 100644
--- a/SmartTaskbar/SystemTray.cs
+++ b/SmartTaskbar/SystemTray.cs
@@ -42,12 +42,7 @@ public SystemTray()
             {
                 Text = resource.GetString("exit")
             };
-            exit.Click += (s, e) =>
-            {
-                switcher.Stop();
-                notifyIcon.Dispose();
-                Application.Exit();
-            };
+            exit.Click += Exit_Click;
             contextMenuStrip = new ContextMenuStrip();
             contextMenuStrip.Items.AddRange(new ToolStripItem[]
             {
@@ -83,6 +78,13 @@ public SystemTray()
             }
         }
 
+        private void Exit_Click(object sender, EventArgs e)
+        {
+            switcher.Stop();
+            notifyIcon.Dispose();
+            Application.Exit();
+        }
+
         private void NotifyIcon_MouseDoubleClick(object sender, MouseEventArgs e)
         {
             if (switcher.IsHide())