diff --git a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
index 9946e2d8e..dc90090cd 100644
--- a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
+++ b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugarCore</id>
-    <version>5.1.4.200-preview01</version>
+    <version>5.1.4.200-preview02</version>
     <authors>sunkaixuan</authors>
     <owners>果糖大数据科技</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>
diff --git a/Src/Asp.NetCore2/SqlSugar/SugarUnitOfWork.cs b/Src/Asp.NetCore2/SqlSugar/SugarUnitOfWork.cs
index 4f46010a8..e29fb3bec 100644
--- a/Src/Asp.NetCore2/SqlSugar/SugarUnitOfWork.cs
+++ b/Src/Asp.NetCore2/SqlSugar/SugarUnitOfWork.cs
@@ -127,7 +127,7 @@ namespace SqlSugar
                 eventAction += action;
                 Db.TempItems[TranSuccessEvent] = eventAction;
             }
-            else
+            else if(Db.TempItems != null)
             {
                 Db.TempItems[TranSuccessEvent] = action;
             }