diff --git a/src/Luban.Job.Cfg/Source/DataCreators/SheetDataCreator.cs b/src/Luban.Job.Cfg/Source/DataCreators/SheetDataCreator.cs
index 34f4e95..c0fbe29 100644
--- a/src/Luban.Job.Cfg/Source/DataCreators/SheetDataCreator.cs
+++ b/src/Luban.Job.Cfg/Source/DataCreators/SheetDataCreator.cs
@@ -351,8 +351,8 @@ namespace Luban.Job.Cfg.DataCreators
                 {
                     if (type.IsNullable)
                     {
-                        string subType = row.GetSubTitleNamedRow(DefBean.TYPE_NAME_KEY).Current.ToString().Trim();
-                        if (subType == DefBean.BEAN_NULL_STR)
+                        string subType = row.GetSubTitleNamedRow(DefBean.TYPE_NAME_KEY).Current?.ToString()?.Trim();
+                        if (subType == null || subType == DefBean.BEAN_NULL_STR)
                         {
                             return null;
                         }
diff --git a/src/Luban.Job.Cfg/Source/Defs/CfgDefLoader.cs b/src/Luban.Job.Cfg/Source/Defs/CfgDefLoader.cs
index aaf9990..76cea4d 100644
--- a/src/Luban.Job.Cfg/Source/Defs/CfgDefLoader.cs
+++ b/src/Luban.Job.Cfg/Source/Defs/CfgDefLoader.cs
@@ -770,7 +770,7 @@ namespace Luban.Job.Cfg.Defs
             return f;
         }
 
-        private static readonly List<string> _beanOptinsAttrs = new List<string> { "value_type", "alias", "sep", "comment", "tags", "group", "externaltype" };
+        private static readonly List<string> _beanOptinsAttrs = new List<string> { "value_type", "alias", "sep", "comment", "tags", "externaltype" };
         private static readonly List<string> _beanRequireAttrs = new List<string> { "name" };
 
         override protected void AddBean(string defineFile, XElement e, string parent)