diff --git a/AutoBuild/tw_165.py b/AutoBuild/tw_165.py
index e4b38b4..4bf7f6b 100644
--- a/AutoBuild/tw_165.py
+++ b/AutoBuild/tw_165.py
@@ -23,6 +23,7 @@ def main():
         r_json = r.json()['result']['records']
     except (JSONDecodeError, KeyError):
         logger.critical('Parse JSON Err')
+        raise
     
     # check if file exists
     filename = 'TW165.txt'
@@ -34,16 +35,18 @@ def main():
 
     with open(filename, 'r') as f:
         read_ = f.read().splitlines()
-        for row in r_json[1:]:
-            domain = urlparse('http://'+row['WEBURL']).hostname
-            if domain not in read_:
-                added_list.append(domain)
-    
-    with open(filename, 'a+') as f:
-        f.write('\n')
-        f.write(
-            '\n'.join(e for e in added_list)
-            )
+    current_domains = frozenset(read_)
+    for row in r_json[1:]:
+        domain = urlparse('http://'+row['WEBURL']).hostname
+        if domain not in current_domains:
+            added_list.append(domain)
+
+    if added_list:
+        with open(filename, 'a+') as f:
+            f.write('\n')
+            f.write(
+                '\n'.join(e for e in added_list)
+                )
 
 if __name__ == '__main__':
     main()
\ No newline at end of file