diff --git a/Falcon.SugarApi/ApiDefinistions/ApiControllerBase.cs b/Falcon.SugarApi/ApiDefinistions/ApiControllerBase.cs
index a8e3e1c..0a5deee 100644
--- a/Falcon.SugarApi/ApiDefinistions/ApiControllerBase.cs
+++ b/Falcon.SugarApi/ApiDefinistions/ApiControllerBase.cs
@@ -35,7 +35,7 @@ namespace Falcon.SugarApi.ApiDefinistions
         /// <summary>
         /// Sugar数据库
         /// </summary>
-        public SugarDbContext SugarDb { get; set; }
+        public SugarDbContext? SugarDb { get; set; }
 
         /// <summary>
         /// 应用程序跟目录
@@ -59,7 +59,7 @@ namespace Falcon.SugarApi.ApiDefinistions
         protected ApiControllerBase(IServiceProvider service) {
             this.Services = service;
             this.Logger = service.GetService(typeof(ILogger<>).MakeGenericType(GetType())) as ILogger ?? throw new NullReferenceException("ILogger");
-            this.SugarDb = service.GetService<SugarDbContext>() ?? throw new NullReferenceException("SugarDbContext");
+            this.SugarDb = service.GetService<SugarDbContext>();
             this.Cache = service.GetService<IDistributedCache>();
         }