diff --git a/source/option.py b/source/option.py
index 167bafb..7a1bc7d 100644
--- a/source/option.py
+++ b/source/option.py
@@ -7,6 +7,7 @@ default_option = {
     "disable_download": False,
     "del_track_after_conv": False,
     "dont_check_for_update": False,
+    "dont_check_track_sha1": False,
     "process_track": 8
 }
 
@@ -21,4 +22,8 @@ def change_option(self, option, value, restart=False):
 def load_option(self):
     if not(os.path.exists("./option.json")):
         with open("./option.json", "w", encoding="utf-8") as f: json.dump(default_option, f, ensure_ascii=False)
-    with open("./option.json", encoding="utf-8") as f: self.option = json.load(f)
\ No newline at end of file
+    with open("./option.json", encoding="utf-8") as f: self.option = json.load(f)
+
+    for option_key, option_value in default_option.items():
+        if not(option_key in self.option):
+            self.option[option_key] = option_value
\ No newline at end of file