diff --git a/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/IDataReaderEntityBuilder.cs b/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/IDataReaderEntityBuilder.cs
index cbc10f259..d390000cd 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/IDataReaderEntityBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/IDataReaderEntityBuilder.cs
@@ -236,7 +236,7 @@ namespace SqlSugar
                     method = getString;
                     if (bindProperyTypeName == "guid")
                     {
-                        method = getConvertStringGuid;
+                        method =isNullableType? getConvertStringGuid : getStringGuid;
                     }
                     break;
                 case CSharpDataType.DateTime: