diff --git a/src/Shriek.ServiceProxy.Socket/Core/Internal/DefaultDependencyResolver.cs b/src/Shriek.ServiceProxy.Socket/Core/Internal/DefaultDependencyResolver.cs
index f2741eb..5618604 100644
--- a/src/Shriek.ServiceProxy.Socket/Core/Internal/DefaultDependencyResolver.cs
+++ b/src/Shriek.ServiceProxy.Socket/Core/Internal/DefaultDependencyResolver.cs
@@ -8,7 +8,7 @@ namespace Shriek.ServiceProxy.Socket.Core.Internal
     /// </summary>
     internal class DefaultDependencyResolver : IDependencyResolver
     {
-        private ICollection<Type> serviceTypes;
+        private readonly ICollection<Type> serviceTypes = new List<Type>();
 
         /// <summary>
         /// 解析支持任意对象创建的一次注册的服务
diff --git a/src/Shriek/Commands/DefaultCommandContext.cs b/src/Shriek/Commands/DefaultCommandContext.cs
index ab336df..1a8a8f3 100644
--- a/src/Shriek/Commands/DefaultCommandContext.cs
+++ b/src/Shriek/Commands/DefaultCommandContext.cs
@@ -87,8 +87,8 @@ public void SaveAggregateRoot<TAggregateRoot>(TAggregateRoot aggregate)
                     //如果不是新增事件
                     if (aggregate.Version != 0)
                     {
-                        var lastestEvent = eventStorage.GetLastEvent(((dynamic)aggregate).AggregateId);
-                        if (lastestEvent != null && lastestEvent.Version != aggregate.Version)
+                        var lastEvent = eventStorage.GetLastEvent(((dynamic)aggregate).AggregateId);
+                        if (lastEvent != null && lastEvent.Version != aggregate.Version)
                         {
                             throw new Exception("事件库中该聚合的状态版本与当前传入聚合状态版本不同，可能已被更新");
                         }
diff --git a/src/Shriek/Exceptions/DomainException.cs b/src/Shriek/Exceptions/DomainException.cs
index 58c8ffd..62186e2 100644
--- a/src/Shriek/Exceptions/DomainException.cs
+++ b/src/Shriek/Exceptions/DomainException.cs
@@ -7,5 +7,9 @@ public class DomainException : Exception
         public DomainException(string msg) : base(msg)
         {
         }
+
+        public DomainException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
     }
 }
\ No newline at end of file