diff --git a/core/src/main/java/com/alibaba/druid/util/MySqlUtils.java b/core/src/main/java/com/alibaba/druid/util/MySqlUtils.java
index 52724363b7..26bb6f0a33 100644
--- a/core/src/main/java/com/alibaba/druid/util/MySqlUtils.java
+++ b/core/src/main/java/com/alibaba/druid/util/MySqlUtils.java
@@ -1417,7 +1417,7 @@ public static java.util.Date parseDate(String str, TimeZone timeZone) {
 
     public static long parseMillis(byte[] str, TimeZone timeZone) {
         if (str == null) {
-            throw new IllegalArgumentException(new String(str, UTF8));
+            throw new IllegalArgumentException("str not be null");
         }
 
         return parseMillis(str, 0, str.length, timeZone);
@@ -1435,7 +1435,7 @@ public static long parseMillis(final byte[] str, final int off, final int len, f
 
     public static ZonedDateTime parseDateTime(final byte[] str, final int off, final int len, ZoneId zoneId) {
         if (str == null) {
-            throw new IllegalArgumentException(new String(str, UTF8));
+            throw new IllegalArgumentException("str not be null");
         }
 
         if (len < 8) {
diff --git a/core/src/test/java/com/alibaba/druid/util/MySqlUtilsTest.java b/core/src/test/java/com/alibaba/druid/util/MySqlUtilsTest.java
new file mode 100644
index 0000000000..ac009dc508
--- /dev/null
+++ b/core/src/test/java/com/alibaba/druid/util/MySqlUtilsTest.java
@@ -0,0 +1,24 @@
+package com.alibaba.druid.util;
+
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+import java.time.ZoneId;
+import java.util.TimeZone;
+
+/**
+ * @author: ruansheng
+ * @date: 2024-01-22
+ */
+public class MySqlUtilsTest extends TestCase {
+
+    public void testParseMillis() {
+        Assert.assertThrows(IllegalArgumentException.class,
+                () -> MySqlUtils.parseMillis(null, TimeZone.getTimeZone("GMT+8")));
+    }
+
+    public void testParseDateTime() {
+        Assert.assertThrows(IllegalArgumentException.class,
+                () -> MySqlUtils.parseDateTime(null, 0, 0, ZoneId.systemDefault()));
+    }
+}
\ No newline at end of file