diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a1e6b70f..ec6a18d4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 ## 5.1.2
 
 ### 新特性
+* 【core 】     XmlUtil支持可选是否输出omit xml declaration（pr#732@Gtihub）
 
 ### Bug修复
 * 【core 】     修复isExpired的bug（issue#733@Gtihub）
diff --git a/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java
index c4bf446ad..fdac8e5eb 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java
@@ -809,7 +809,7 @@ public class XmlUtil {
 
 			childEle = (Element) childNode;
 			final Object value = result.get(childEle.getNodeName());
-			Object newValue = null;
+			Object newValue;
 			if (childEle.hasChildNodes()) {
 				// 子节点继续递归遍历
 				final Map<String, Object> map = xmlToMap(childEle);