diff --git a/plusone-basic/plusone-basic-domain/src/main/java/xyz/zhouxy/plusone/domain/ValidatableStringRecord.java b/plusone-basic/plusone-basic-domain/src/main/java/xyz/zhouxy/plusone/domain/ValidatableStringRecord.java
index a44c675..37151a2 100644
--- a/plusone-basic/plusone-basic-domain/src/main/java/xyz/zhouxy/plusone/domain/ValidatableStringRecord.java
+++ b/plusone-basic/plusone-basic-domain/src/main/java/xyz/zhouxy/plusone/domain/ValidatableStringRecord.java
@@ -35,6 +35,6 @@ public abstract class ValidatableStringRecord implements IValueObject {
     }
 
     public static String getValueOrNull(Optional<? extends ValidatableStringRecord> s) {
-        return s.map(ValidatableStringRecord::value).orElse(null);
+        return s.isPresent() ? s.get().value() : null;
     }
 }