diff --git a/Flow.Launcher.Core/ProgressBoxEx.xaml.cs b/Flow.Launcher.Core/ProgressBoxEx.xaml.cs
index 9a32f7303..f5d34617b 100644
--- a/Flow.Launcher.Core/ProgressBoxEx.xaml.cs
+++ b/Flow.Launcher.Core/ProgressBoxEx.xaml.cs
@@ -66,11 +66,16 @@ namespace Flow.Launcher.Core
 
         private new void Close()
         {
+            if (!Application.Current.Dispatcher.CheckAccess())
+            {
+                Application.Current.Dispatcher.Invoke(Close);
+            }
+
             if (_isClosed)
             {
                 return;
             }
-            
+
             base.Close();
             _isClosed = true;
         }
diff --git a/Flow.Launcher.Plugin/IProgressBoxEx.cs b/Flow.Launcher.Plugin/IProgressBoxEx.cs
index 6468e3c83..27b061895 100644
--- a/Flow.Launcher.Plugin/IProgressBoxEx.cs
+++ b/Flow.Launcher.Plugin/IProgressBoxEx.cs
@@ -6,7 +6,7 @@
 public interface IProgressBoxEx
 {
     /// <summary>
-    /// Show progress box. It should be called from the main ui thread.
+    /// Show progress box.
     /// </summary>
     /// <param name="progress">
     /// Progress value. Should be between 0 and 100. When progress is 100, the progress box will be closed.
@@ -14,7 +14,7 @@ public interface IProgressBoxEx
     public void ReportProgress(double progress);
 
     /// <summary>
-    /// Close progress box. It should be called from the main ui thread.
+    /// Close progress box.
     /// </summary>
     public void Close();
 }
diff --git a/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs b/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
index 2923f7eef..0af2af5ec 100644
--- a/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
+++ b/Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs
@@ -196,7 +196,7 @@ namespace Flow.Launcher.Plugin.PluginsManager
                         if (downloadCancelled)
                             return;
                         else
-                            CleanupProgressBoxEx(prgBox);
+                            prgBox?.Close();
                     }
                     else
                     {
@@ -217,7 +217,7 @@ namespace Flow.Launcher.Plugin.PluginsManager
             catch (HttpRequestException e)
             {
                 // force close progress box
-                CleanupProgressBoxEx(prgBox);
+                prgBox?.Close();
 
                 // show error message
                 Context.API.ShowMsgError(
@@ -230,7 +230,7 @@ namespace Flow.Launcher.Plugin.PluginsManager
             catch (Exception e)
             {
                 // force close progress box
-                CleanupProgressBoxEx(prgBox);
+                prgBox?.Close();
 
                 // show error message
                 Context.API.ShowMsgError(Context.API.GetTranslation("plugin_pluginsmanager_install_error_title"),
@@ -256,14 +256,6 @@ namespace Flow.Launcher.Plugin.PluginsManager
             }
         }
 
-        private static void CleanupProgressBoxEx(IProgressBoxEx prgBox)
-        {
-            Application.Current.Dispatcher.Invoke(() =>
-            {
-                prgBox?.Close();
-            });
-        }
-
         internal async ValueTask<List<Result>> RequestUpdateAsync(string search, CancellationToken token,
             bool usePrimaryUrlOnly = false)
         {