From a4f5a084b8faa0f97e82d55fd8840e83beea5e44 Mon Sep 17 00:00:00 2001
From: 18855532268 <yao1044884220**>
Date: Thu, 18 Sep 2025 23:18:15 +0800
Subject: [PATCH] =?UTF-8?q?fix:=E6=B7=BB=E5=8A=A0=E5=88=A4=E7=A9=BA?=
 =?UTF-8?q?=E5=A4=84=E7=90=86?=
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---
 .../src/main/java/cn/hutool/extra/pinyin/PinyinUtil.java    | 2 +-
 .../test/java/cn/hutool/extra/pinyin/PinyinUtilTest.java    | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/hutool-extra/src/main/java/cn/hutool/extra/pinyin/PinyinUtil.java b/hutool-extra/src/main/java/cn/hutool/extra/pinyin/PinyinUtil.java
index d6ac1497f..721aa777b 100644
--- a/hutool-extra/src/main/java/cn/hutool/extra/pinyin/PinyinUtil.java
+++ b/hutool-extra/src/main/java/cn/hutool/extra/pinyin/PinyinUtil.java
@@ -104,7 +104,7 @@ public class PinyinUtil {
 	 * @return 汉字返回拼音，非汉字原样返回
 	 */
 	public static String getFirstLetter(String str, String separator) {
-		return getEngine().getFirstLetter(str, separator);
+		return (str == null) ? null : getEngine().getFirstLetter(str, separator);
 	}
 
 	/**
diff --git a/hutool-extra/src/test/java/cn/hutool/extra/pinyin/PinyinUtilTest.java b/hutool-extra/src/test/java/cn/hutool/extra/pinyin/PinyinUtilTest.java
index ac1dee5c5..803da9e2e 100644
--- a/hutool-extra/src/test/java/cn/hutool/extra/pinyin/PinyinUtilTest.java
+++ b/hutool-extra/src/test/java/cn/hutool/extra/pinyin/PinyinUtilTest.java
@@ -22,4 +22,10 @@ public class PinyinUtilTest {
 		final String result = PinyinUtil.getFirstLetter("崞阳", ", ");
 		assertEquals("g, y", result);
 	}
+
+	@Test
+	public void getFirstLetterTest3(){
+		final String result = PinyinUtil.getFirstLetter(null, ", ");
+		assertNull(result);
+	}
 }