diff --git a/src/main/java/mpo/dayon/common/utils/SystemUtilities.java b/src/main/java/mpo/dayon/common/utils/SystemUtilities.java
index 629ea1d7..fbfb6d1e 100644
--- a/src/main/java/mpo/dayon/common/utils/SystemUtilities.java
+++ b/src/main/java/mpo/dayon/common/utils/SystemUtilities.java
@@ -216,8 +216,7 @@ public static boolean isValidToken(String token) throws NoSuchAlgorithmException
 
     static String checksum(String input) throws NoSuchAlgorithmException {
         MessageDigest objSHA = MessageDigest.getInstance("SHA-1");
-        byte[] bytSHA = objSHA != null ? objSHA.digest(input.getBytes()) : new byte[0];
-        String hash = new BigInteger(1, bytSHA).toString(16);
+        String hash = new BigInteger(1, objSHA.digest(input.getBytes())).toString(16);
         return hash.substring(hash.length()-1).toUpperCase();
     }