diff --git a/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs b/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
index 55896d176..8091c7c23 100644
--- a/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
+++ b/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
@@ -370,6 +370,7 @@ namespace SqlSugar
                 else
                     return Enum.ToObject(type, value);
             }
+            if (value is string && type == typeof(Guid?)) return value.IsNullOrEmpty() ? null : (Guid?)new Guid(value as string);
             if (!type.IsInterface && type.IsGenericType)
             {
                 Type innerType = type.GetGenericArguments()[0];