diff --git a/binding/javascript/tests/ip.test.js b/binding/javascript/tests/ip.test.js
index 2e78433..66f43c0 100644
--- a/binding/javascript/tests/ip.test.js
+++ b/binding/javascript/tests/ip.test.js
@@ -23,8 +23,8 @@ test('parse ip address', () => {
             return;
         }
 
-        let to_Str = ipBytes == null ? '0' : util.ipToString(ipBytes, true);
-        let toByte = ipBytes == null ? '0' : util.ipBytesString(ipBytes);
+        let to_Str = util.ipToString(ipBytes, true);
+        let toByte = util.ipBytesString(ipBytes);
         console.log(`parseIP(${ipString}): {Bytes: ${toByte}, String: ${to_Str}}`);
         expect(ipString).toBe(to_Str);
     });