diff --git a/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs b/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
index 3a3d7fcbd..97b14c92d 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
@@ -269,7 +269,7 @@ namespace SqlSugar
                 .Where(it => it is SugarColumn)
                 .Select(it => (SugarColumn)it)
                 .FirstOrDefault();
-                column.ExtendedAttribute = sugarColumn.ExtendedAttribute;
+                column.ExtendedAttribute = sugarColumn?.ExtendedAttribute;
                 column.DbTableName = result.DbTableName;
                 column.EntityName = result.EntityName;
                 column.PropertyName = property.Name;
diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
index 3a3d7fcbd..97b14c92d 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/EntityMaintenance/EntityMaintenance.cs
@@ -269,7 +269,7 @@ namespace SqlSugar
                 .Where(it => it is SugarColumn)
                 .Select(it => (SugarColumn)it)
                 .FirstOrDefault();
-                column.ExtendedAttribute = sugarColumn.ExtendedAttribute;
+                column.ExtendedAttribute = sugarColumn?.ExtendedAttribute;
                 column.DbTableName = result.DbTableName;
                 column.EntityName = result.EntityName;
                 column.PropertyName = property.Name;