diff --git a/Flow.Launcher.Core/Plugin/JsonPRCModel.cs b/Flow.Launcher.Core/Plugin/JsonPRCModel.cs
index 2b3bd61b0..5232e46da 100644
--- a/Flow.Launcher.Core/Plugin/JsonPRCModel.cs
+++ b/Flow.Launcher.Core/Plugin/JsonPRCModel.cs
@@ -30,12 +30,8 @@ namespace Flow.Launcher.Core.Plugin
         public string Data { get; set; }
     }
 
-    public class JsonRPCModelBase
-    {
-        public int Id { get; set; }
-    }
 
-    public class JsonRPCResponseModel : JsonRPCModelBase
+    public class JsonRPCResponseModel
     {
         public string Result { get; set; }
 
@@ -49,18 +45,20 @@ namespace Flow.Launcher.Core.Plugin
 
         public string DebugMessage { get; set; }
     }
-
-    public class JsonRPCRequestModel : JsonRPCModelBase
+    
+    public class JsonRPCRequestModel
     {
-        [JsonPropertyName("method")]
         public string Method { get; set; }
 
-        [JsonPropertyName("parameters")]
         public object[] Parameters { get; set; }
 
+        private static readonly JsonSerializerOptions options = new()
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+        };
         public override string ToString()
         {
-            return JsonSerializer.Serialize(this);
+            return JsonSerializer.Serialize(this, options);
         }
     }
 
@@ -77,7 +75,6 @@ namespace Flow.Launcher.Core.Plugin
     /// </summary>
     public class JsonRPCClientRequestModel : JsonRPCRequestModel
     {
-        [JsonPropertyName("dontHideAfterAction")]
         public bool DontHideAfterAction { get; set; }
     }
 
diff --git a/Flow.Launcher.Core/Plugin/JsonRPCPlugin.cs b/Flow.Launcher.Core/Plugin/JsonRPCPlugin.cs
index 65f8fc608..431458881 100644
--- a/Flow.Launcher.Core/Plugin/JsonRPCPlugin.cs
+++ b/Flow.Launcher.Core/Plugin/JsonRPCPlugin.cs
@@ -47,8 +47,10 @@ namespace Flow.Launcher.Core.Plugin
             }
         }
 
-        private static readonly JsonSerializerOptions _options = new()
+        private static readonly JsonSerializerOptions options = new()
         {
+            PropertyNameCaseInsensitive = true,
+            IgnoreNullValues = true,
             Converters =
             {
                 new JsonObjectConverter()
@@ -60,8 +62,10 @@ namespace Flow.Launcher.Core.Plugin
             if (output == Stream.Null) return null;
 
             var queryResponseModel = await
-                JsonSerializer.DeserializeAsync<JsonRPCQueryResponseModel>(output, _options);
+                JsonSerializer.DeserializeAsync<JsonRPCQueryResponseModel>(output, options);
 
+            await output.DisposeAsync();
+            
             return ParseResults(queryResponseModel);
         }
 
@@ -70,7 +74,7 @@ namespace Flow.Launcher.Core.Plugin
             if (string.IsNullOrEmpty(output)) return null;
 
             var queryResponseModel =
-                JsonSerializer.Deserialize<JsonRPCQueryResponseModel>(output, _options);
+                JsonSerializer.Deserialize<JsonRPCQueryResponseModel>(output, options);
             return ParseResults(queryResponseModel);
         }
 
@@ -110,7 +114,7 @@ namespace Flow.Launcher.Core.Plugin
                             return !result.JsonRPCAction.DontHideAfterAction;
                         }
 
-                        var jsonRpcRequestModel = JsonSerializer.Deserialize<JsonRPCRequestModel>(actionResponse, _options);
+                        var jsonRpcRequestModel = JsonSerializer.Deserialize<JsonRPCRequestModel>(actionResponse, options);
 
                         if (jsonRpcRequestModel?.Method?.StartsWith("Flow.Launcher.") ?? false)
                         {
diff --git a/Flow.Launcher.Core/Plugin/PluginManager.cs b/Flow.Launcher.Core/Plugin/PluginManager.cs
index a2a009329..134c3c002 100644
--- a/Flow.Launcher.Core/Plugin/PluginManager.cs
+++ b/Flow.Launcher.Core/Plugin/PluginManager.cs
@@ -58,6 +58,22 @@ namespace Flow.Launcher.Core.Plugin
             API.SavePluginSettings();
         }
 
+        public static async ValueTask DisposePluginsAsync()
+        {
+            foreach (var pluginPair in AllPlugins)
+            {
+                switch (pluginPair.Plugin)
+                {
+                    case IDisposable disposable:
+                        disposable.Dispose();
+                        break;
+                    case IAsyncDisposable asyncDisposable:
+                        await asyncDisposable.DisposeAsync();
+                        break;
+                }
+            }
+        }
+
         public static async Task ReloadData()
         {
             await Task.WhenAll(AllPlugins.Select(plugin => plugin.Plugin switch
diff --git a/Flow.Launcher/MainWindow.xaml.cs b/Flow.Launcher/MainWindow.xaml.cs
index 735103938..5fab812e6 100644
--- a/Flow.Launcher/MainWindow.xaml.cs
+++ b/Flow.Launcher/MainWindow.xaml.cs
@@ -11,6 +11,7 @@ using Flow.Launcher.Core.Resource;
 using Flow.Launcher.Helper;
 using Flow.Launcher.Infrastructure.UserSettings;
 using Flow.Launcher.ViewModel;
+using Application = System.Windows.Application;
 using Screen = System.Windows.Forms.Screen;
 using ContextMenuStrip = System.Windows.Forms.ContextMenuStrip;
 using DataFormats = System.Windows.DataFormats;
@@ -46,10 +47,13 @@ namespace Flow.Launcher
             InitializeComponent();
         }
 
-        private void OnClosing(object sender, CancelEventArgs e)
+        private async void OnClosing(object sender, CancelEventArgs e)
         {
             _notifyIcon.Visible = false;
             _viewModel.Save();
+            e.Cancel = true;
+            await PluginManager.DisposePluginsAsync();
+            Application.Current.Shutdown();
         }
 
         private void OnInitialized(object sender, EventArgs e)
diff --git a/Flow.Launcher/Storage/UserSelectedRecord.cs b/Flow.Launcher/Storage/UserSelectedRecord.cs
index 8d8956cfa..23d8c4faf 100644
--- a/Flow.Launcher/Storage/UserSelectedRecord.cs
+++ b/Flow.Launcher/Storage/UserSelectedRecord.cs
@@ -28,6 +28,11 @@ namespace Flow.Launcher.Storage
 
         private static int GenerateStaticHashCode(string s, int start = HASH_INITIAL)
         {
+            if (s == null)
+            {
+                return start;
+            }
+
             unchecked
             {
                 // skip the empty space
@@ -101,4 +106,4 @@ namespace Flow.Launcher.Storage
             return selectedCount;
         }
     }
-}
+}
\ No newline at end of file
diff --git a/Plugins/Flow.Launcher.Plugin.PluginsManager/Languages/sk.xaml b/Plugins/Flow.Launcher.Plugin.PluginsManager/Languages/sk.xaml
index fe5afa317..52cd784ee 100644
--- a/Plugins/Flow.Launcher.Plugin.PluginsManager/Languages/sk.xaml
+++ b/Plugins/Flow.Launcher.Plugin.PluginsManager/Languages/sk.xaml
@@ -19,6 +19,8 @@
     <system:String x:Key="plugin_pluginsmanager_update_title">Aktualizácia pluginu</system:String>
     <system:String x:Key="plugin_pluginsmanager_update_exists">Tento plugin má dostupnú aktualizáciu, chcete ju zobraziť?</system:String>
     <system:String x:Key="plugin_pluginsmanager_update_alreadyexists">Tento plugin je už nainštalovaný</system:String>
+    <system:String x:Key="plugin_pluginsmanager_update_failed_title">Stiahnutie manifestu pluginu zlyhalo</system:String>
+    <system:String x:Key="plugin_pluginsmanager_update_failed_subtitle">Skontrolujte, či sa môžete pripojiť na github.com. Táto chyba znamená, že pravdepodobne nemôžete pluginy inštalovať alebo aktualizovať.</system:String>
     
     <!--Controls-->
     
diff --git a/Plugins/Flow.Launcher.Plugin.PluginsManager/plugin.json b/Plugins/Flow.Launcher.Plugin.PluginsManager/plugin.json
index a0b84ac9a..255546686 100644
--- a/Plugins/Flow.Launcher.Plugin.PluginsManager/plugin.json
+++ b/Plugins/Flow.Launcher.Plugin.PluginsManager/plugin.json
@@ -6,7 +6,7 @@
   "Name": "Plugins Manager",
   "Description": "Management of installing, uninstalling or updating Flow Launcher plugins",
   "Author": "Jeremy Wu",
-  "Version": "1.8.2",
+  "Version": "1.8.3",
   "Language": "csharp",
   "Website": "https://github.com/Flow-Launcher/Flow.Launcher",
   "ExecuteFileName": "Flow.Launcher.Plugin.PluginsManager.dll",
diff --git a/Plugins/Flow.Launcher.Plugin.Program/ProgramSuffixes.xaml.cs b/Plugins/Flow.Launcher.Plugin.Program/ProgramSuffixes.xaml.cs
index d9ea3ad97..6b1f072f1 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/ProgramSuffixes.xaml.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/ProgramSuffixes.xaml.cs
@@ -1,4 +1,5 @@
-using System.Windows;
+using System;
+using System.Windows;
 
 namespace Flow.Launcher.Plugin.Program
 {
@@ -20,18 +21,21 @@ namespace Flow.Launcher.Plugin.Program
 
         private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
         {
-            if (string.IsNullOrEmpty(tbSuffixes.Text))
+            var suffixes = tbSuffixes.Text.Split(Settings.SuffixSeperator, StringSplitOptions.RemoveEmptyEntries);
+
+            if (suffixes.Length == 0)
             {
                 string warning = context.API.GetTranslation("flowlauncher_plugin_program_suffixes_cannot_empty");
                 MessageBox.Show(warning);
                 return;
             }
 
-            _settings.ProgramSuffixes = tbSuffixes.Text.Split(Settings.SuffixSeperator);
+            _settings.ProgramSuffixes = suffixes;
+
             string msg = context.API.GetTranslation("flowlauncher_plugin_program_update_file_suffixes");
             MessageBox.Show(msg);
 
             DialogResult = true;
         }
     }
-}
+}
\ No newline at end of file
diff --git a/Plugins/Flow.Launcher.Plugin.Program/plugin.json b/Plugins/Flow.Launcher.Plugin.Program/plugin.json
index fe7a3415d..a37075b0c 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/plugin.json
+++ b/Plugins/Flow.Launcher.Plugin.Program/plugin.json
@@ -4,7 +4,7 @@
   "Name": "Program",
   "Description": "Search programs in Flow.Launcher",
   "Author": "qianlifeng",
-  "Version": "1.5.3",
+  "Version": "1.5.4",
   "Language": "csharp",
   "Website": "https://github.com/Flow-Launcher/Flow.Launcher",
   "ExecuteFileName": "Flow.Launcher.Plugin.Program.dll",
diff --git a/Plugins/Flow.Launcher.Plugin.WebSearch/Languages/sk.xaml b/Plugins/Flow.Launcher.Plugin.WebSearch/Languages/sk.xaml
index e71eaf345..90eb19cc9 100644
--- a/Plugins/Flow.Launcher.Plugin.WebSearch/Languages/sk.xaml
+++ b/Plugins/Flow.Launcher.Plugin.WebSearch/Languages/sk.xaml
@@ -1,6 +1,7 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:system="clr-namespace:System;assembly=mscorlib">
+                    
     <system:String x:Key="flowlauncher_plugin_websearch_open_search_in">Otvoriť vyhľadávanie v:</system:String>
     <system:String x:Key="flowlauncher_plugin_websearch_new_window">Nové okno</system:String>
     <system:String x:Key="flowlauncher_plugin_websearch_new_tab">Nová karta</system:String>