diff --git a/Yi.Abp.Net8/framework/Yi.Framework.SqlSugarCore/DefaultSqlSugarDbContext.cs b/Yi.Abp.Net8/framework/Yi.Framework.SqlSugarCore/DefaultSqlSugarDbContext.cs
index 3245b95f..85f71a55 100644
--- a/Yi.Abp.Net8/framework/Yi.Framework.SqlSugarCore/DefaultSqlSugarDbContext.cs
+++ b/Yi.Abp.Net8/framework/Yi.Framework.SqlSugarCore/DefaultSqlSugarDbContext.cs
@@ -61,7 +61,12 @@ public class DefaultSqlSugarDbContext : SqlSugarDbContext
 
                 if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.LastModificationTime)))
                 {
-                    if (!DateTime.MinValue.Equals(oldValue))
+                    //最后更新时间，已经是最小值，忽略
+                    if (DateTime.MinValue.Equals(oldValue))
+                    {
+                        entityInfo.SetValue(null);
+                    }
+                    else
                     {
                         entityInfo.SetValue(DateTime.Now);
                     }
@@ -70,7 +75,12 @@ public class DefaultSqlSugarDbContext : SqlSugarDbContext
                 {
                     if (typeof(Guid?) == entityInfo.EntityColumnInfo.PropertyInfo.PropertyType)
                     {
-                        if (CurrentUser.Id != null)
+                        //最后更新者，已经是空guid，忽略
+                        if (Guid.Empty.Equals(oldValue))
+                        {
+                            entityInfo.SetValue(null);
+                        }
+                        else if (CurrentUser.Id != null)
                         {
                             entityInfo.SetValue(CurrentUser.Id);
                         }
diff --git a/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/Entities/Forum/DiscussAggregateRoot.cs b/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/Entities/Forum/DiscussAggregateRoot.cs
index be562f33..24ef78b8 100644
--- a/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/Entities/Forum/DiscussAggregateRoot.cs
+++ b/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/Entities/Forum/DiscussAggregateRoot.cs
@@ -24,6 +24,15 @@ namespace Yi.Framework.Bbs.Domain.Entities.Forum
             PlateId = plateId;
         }
 
+        public void AddSeeNumber()
+        {
+            this.SeeNum += 1;
+            //设置最小值，不更新
+            this.LastModificationTime = DateTime.MinValue;
+            //设置空值，不更新
+            this.LastModifierId = Guid.Empty;
+        }
+
         [SugarColumn(ColumnName = "Id", IsPrimaryKey = true)]
         public override Guid Id { get; protected set; }
         public string? Title { get; set; }
diff --git a/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/EventHandlers/SeeDiscussEventHandler.cs b/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/EventHandlers/SeeDiscussEventHandler.cs
index b9411b40..f82b15dd 100644
--- a/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/EventHandlers/SeeDiscussEventHandler.cs
+++ b/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/EventHandlers/SeeDiscussEventHandler.cs
@@ -23,13 +23,9 @@ namespace Yi.Framework.Bbs.Domain.EventHandlers
             var entity = await _repository.GetAsync(eventData.DiscussId);
             if (entity is not null)
             {
-                entity.SeeNum += 1;
+                entity.AddSeeNumber();
                 await _repository.UpdateAsync(entity);
             }
         }
-
-
-
-
     }
 }
diff --git a/Yi.Abp.Net8/module/chat-hub/Yi.Framework.ChatHub.Domain/Managers/AiManager.cs b/Yi.Abp.Net8/module/chat-hub/Yi.Framework.ChatHub.Domain/Managers/AiManager.cs
index a8571f2b..7c64ea9b 100644
--- a/Yi.Abp.Net8/module/chat-hub/Yi.Framework.ChatHub.Domain/Managers/AiManager.cs
+++ b/Yi.Abp.Net8/module/chat-hub/Yi.Framework.ChatHub.Domain/Managers/AiManager.cs
@@ -53,7 +53,7 @@ namespace Yi.Framework.ChatHub.Domain.Managers
             {
                 if (result.Successful)
                 {
-                    yield return result.Choices.FirstOrDefault()?.Message.Content ?? string.Empty;
+                    yield return result.Choices.FirstOrDefault()?.Message.Content ?? null;
                 }
                 else
                 {