diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7f929b2b..a9008a4f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,7 @@
 * 【core   】     修复FileResource构造fileName参数无效问题（issue#1942@Github）
 * 【cache  】     修复WeakCache键值强关联导致的无法回收问题（issue#1953@Github）
 * 【core   】     修复ZipUtil相对路径父路径获取null问题（issue#1961@Github）
+* 【http   】     修复HttpUtil.normalizeParams未判空导致的问题（issue#1975@Github）
 
 -------------------------------------------------------------------------------------------------------------
 
diff --git a/hutool-core/src/test/java/cn/hutool/core/util/ArrayUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/util/ArrayUtilTest.java
index a7755e00e..5a0d71ca8 100644
--- a/hutool-core/src/test/java/cn/hutool/core/util/ArrayUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/util/ArrayUtilTest.java
@@ -182,6 +182,12 @@ public class ArrayUtilTest {
 		Assert.assertEquals(9, range[9]);
 	}
 
+	@Test(expected = NegativeArraySizeException.class)
+	public void rangeMinTest() {
+		//noinspection ResultOfMethodCallIgnored
+		ArrayUtil.range(0, Integer.MIN_VALUE);
+	}
+
 	@Test
 	public void maxTest() {
 		int max = ArrayUtil.max(1, 2, 13, 4, 5);
diff --git a/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java b/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java
index 0257cd464..ffe7ed669 100644
--- a/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java
+++ b/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java
@@ -539,6 +539,9 @@ public class HttpUtil {
 	 * @since 4.5.2
 	 */
 	public static String normalizeParams(String paramPart, Charset charset) {
+		if(StrUtil.isEmpty(paramPart)){
+			return paramPart;
+		}
 		final StrBuilder builder = StrBuilder.create(paramPart.length() + 16);
 		final int len = paramPart.length();
 		String name = null;
diff --git a/hutool-http/src/test/java/cn/hutool/http/HttpUtilTest.java b/hutool-http/src/test/java/cn/hutool/http/HttpUtilTest.java
index e829d7752..00ad46b87 100644
--- a/hutool-http/src/test/java/cn/hutool/http/HttpUtilTest.java
+++ b/hutool-http/src/test/java/cn/hutool/http/HttpUtilTest.java
@@ -302,6 +302,12 @@ public class HttpUtilTest {
 		Assert.assertEquals("%E5%8F%82%E6%95%B0", encodeResult);
 	}
 
+	@Test
+	public void normalizeBlankParamsTest() {
+		String encodeResult = HttpUtil.normalizeParams("", CharsetUtil.CHARSET_UTF_8);
+		Assert.assertEquals("", encodeResult);
+	}
+
 	@Test
 	public void getMimeTypeTest() {
 		String mimeType = HttpUtil.getMimeType("aaa.aaa");