diff --git a/src/TokenizerBuilder.js b/src/TokenizerBuilder.js
index 9ef5c6a2..a36a1769 100644
--- a/src/TokenizerBuilder.js
+++ b/src/TokenizerBuilder.js
@@ -27,7 +27,7 @@ var DictionaryLoader = require("./loader/NodeDictionaryLoader");
  * @constructor
  */
 function TokenizerBuilder(option) {
-    if (option.dicPath == null) {
+    if (!option || option.dicPath == null) {
         this.dic_path = "dict/";
     } else {
         this.dic_path = option.dicPath;