diff --git a/src/Server.UI/Components/Autocompletes/LanguageAutocomplete.cs b/src/Server.UI/Components/Autocompletes/LanguageAutocomplete.cs
index 6504322f3..98c56d5f9 100644
--- a/src/Server.UI/Components/Autocompletes/LanguageAutocomplete.cs
+++ b/src/Server.UI/Components/Autocompletes/LanguageAutocomplete.cs
@@ -18,7 +18,7 @@ public LanguageAutocomplete()
 
     private List<LanguageCode> Languages { get; set; } = LocalizationConstants.SupportedLanguages.ToList();
 
-    private Task<IEnumerable<string>> SearchFunc_(string value, CancellationToken cancellation = default)
+    private Task<IEnumerable<string>> SearchFunc_(string? value, CancellationToken cancellation = default)
     {
         // 如果输入为空，返回完整的语言列表；否则进行模糊搜索
         return string.IsNullOrEmpty(value)
diff --git a/src/Server.UI/Components/Autocompletes/MultiTenantAutocomplete.razor.cs b/src/Server.UI/Components/Autocompletes/MultiTenantAutocomplete.razor.cs
index 4ba0cf5bc..cc6b22c0e 100644
--- a/src/Server.UI/Components/Autocompletes/MultiTenantAutocomplete.razor.cs
+++ b/src/Server.UI/Components/Autocompletes/MultiTenantAutocomplete.razor.cs
@@ -33,7 +33,7 @@ protected override async ValueTask DisposeAsyncCore()
         await base.DisposeAsyncCore();
     }
 
-    private Task<IEnumerable<TenantDto>> SearchKeyValues(string value, CancellationToken cancellation)
+    private Task<IEnumerable<TenantDto>> SearchKeyValues(string? value, CancellationToken cancellation)
     {
         IEnumerable<TenantDto> result;
 
diff --git a/src/Server.UI/Components/Autocompletes/PickSuperiorIdAutocomplete.razor.cs b/src/Server.UI/Components/Autocompletes/PickSuperiorIdAutocomplete.razor.cs
index 95b6d7628..390cf9d1f 100644
--- a/src/Server.UI/Components/Autocompletes/PickSuperiorIdAutocomplete.razor.cs
+++ b/src/Server.UI/Components/Autocompletes/PickSuperiorIdAutocomplete.razor.cs
@@ -20,7 +20,7 @@ public PickSuperiorIdAutocomplete()
 
     [Inject] private IUserService UserService { get; set; } = default!;
 
-    private Task<IEnumerable<ApplicationUserDto>> SearchKeyValues(string value, CancellationToken cancellation)
+    private Task<IEnumerable<ApplicationUserDto>> SearchKeyValues(string? value, CancellationToken cancellation)
     {
         var result = UserService.DataSource.Where(x =>
             x.TenantId != null && x.TenantId.Equals(TenantId) && !x.UserName.Equals(OwnerName));
diff --git a/src/Server.UI/Components/Autocompletes/PickUserAutocomplete.razor.cs b/src/Server.UI/Components/Autocompletes/PickUserAutocomplete.razor.cs
index 0ba5ca5e7..f8133a510 100644
--- a/src/Server.UI/Components/Autocompletes/PickUserAutocomplete.razor.cs
+++ b/src/Server.UI/Components/Autocompletes/PickUserAutocomplete.razor.cs
@@ -36,7 +36,7 @@ protected override async ValueTask DisposeAsyncCore()
         await base.DisposeAsyncCore();
     }
 
-    private Task<IEnumerable<ApplicationUserDto>> SearchKeyValues(string value, CancellationToken cancellation)
+    private Task<IEnumerable<ApplicationUserDto>> SearchKeyValues(string? value, CancellationToken cancellation)
     {
         var result = UserService.DataSource.Where(x => x.TenantId != null && x.TenantId.Equals(TenantId));
 
diff --git a/src/Server.UI/Components/Autocompletes/PicklistAutocomplete.razor.cs b/src/Server.UI/Components/Autocompletes/PicklistAutocomplete.razor.cs
index b8ddff3c6..4637fea35 100644
--- a/src/Server.UI/Components/Autocompletes/PicklistAutocomplete.razor.cs
+++ b/src/Server.UI/Components/Autocompletes/PicklistAutocomplete.razor.cs
@@ -40,7 +40,7 @@ protected override async ValueTask DisposeAsyncCore()
         await base.DisposeAsyncCore();
     }
 
-    private Task<IEnumerable<string>> SearchFunc_(string value, CancellationToken cancellation = default)
+    private Task<IEnumerable<string>> SearchFunc_(string? value, CancellationToken cancellation = default)
     {
         // if text is null or empty, show complete list
         return string.IsNullOrEmpty(value)
diff --git a/src/Server.UI/Components/Autocompletes/TimeZoneAutocomplete.cs b/src/Server.UI/Components/Autocompletes/TimeZoneAutocomplete.cs
index 5ffa53b57..340d80562 100644
--- a/src/Server.UI/Components/Autocompletes/TimeZoneAutocomplete.cs
+++ b/src/Server.UI/Components/Autocompletes/TimeZoneAutocomplete.cs
@@ -16,7 +16,7 @@ public TimeZoneAutocomplete()
 
     private List<TimeZoneInfo> TimeZones { get; set; } = TimeZoneInfo.GetSystemTimeZones().ToList();
 
-    private Task<IEnumerable<string>> SearchFunc_(string value, CancellationToken cancellation = default)
+    private Task<IEnumerable<string>> SearchFunc_(string? value, CancellationToken cancellation = default)
     {
         return string.IsNullOrEmpty(value)
             ? Task.FromResult(TimeZones.Select(tz => tz.Id).AsEnumerable())
diff --git a/src/Server.UI/Server.UI.csproj b/src/Server.UI/Server.UI.csproj
index a01317dfa..bdf5992c3 100644
--- a/src/Server.UI/Server.UI.csproj
+++ b/src/Server.UI/Server.UI.csproj
@@ -20,7 +20,7 @@
         <PackageReference Include="BlazorDownloadFile" Version="2.4.0.2" />
         <PackageReference Include="SixLabors.ImageSharp" Version="3.1.6" />
         <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="9.0.0" />
-        <PackageReference Include="MudBlazor" Version="8.0.0-preview.5" />
+        <PackageReference Include="MudBlazor" Version="8.0.0-preview.6" />
         <PackageReference Include="Toolbelt.Blazor.HotKeys2" Version="5.1.0" />
         <PackageReference Include="Blazor-ApexCharts" Version="4.0.1" />
         <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="9.0.0">