diff --git a/src/main/java/com/actiontech/dble/util/HexFormatUtil.java b/src/main/java/com/actiontech/dble/util/HexFormatUtil.java
index 364d38870b..6b025d011c 100644
--- a/src/main/java/com/actiontech/dble/util/HexFormatUtil.java
+++ b/src/main/java/com/actiontech/dble/util/HexFormatUtil.java
@@ -17,6 +17,9 @@ private HexFormatUtil() {
     private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
 
     public static String bytesToHexString(byte[] bytes) {
+        if (bytes == null) {
+            return null;
+        }
         char[] hexChars = new char[bytes.length * 2];
         for (int j = 0; j < bytes.length; j++) {
             int v = bytes[j] & 0xFF;