diff --git a/update_db.py b/update_db.py
index 4aec5ab..530d5ce 100644
--- a/update_db.py
+++ b/update_db.py
@@ -358,18 +358,19 @@ def search_nico_by_tags (
         if video.code in result_by_video_code:
             continue
         try:
-            video_data = fetch_video_data (video.code)['data']
-            owner = video_data.get ('owner') or { }
-            video = video_data['video']
-            result_by_video_code[video.code] = {
-                    'contentId':    video.code,
+            tracked_video = video
+            video_data = fetch_video_data (tracked_video.code)['data']
+            owner = video_data.get ('owner') or {}
+            video_info = video_data['video']
+            result_by_video_code[tracked_video.code] = {
+                    'contentId':    tracked_video.code,
                     'userId':       owner.get ('id'),
-                    'title':        video['title'],
+                    'title':        video_info['title'],
                     'tags':         ' '.join (map (lambda t: t['name'],
                                                    video_data['tag']['items'])),
-                    'description':  video['description'],
-                    'viewCounter':  video['count']['view'],
-                    'startTime':    video['registeredAt'] }
+                    'description':  video_info['description'],
+                    'viewCounter':  video_info['count']['view'],
+                    'startTime':    video_info['registeredAt'] }
         except (KeyError,
                 TypeError,
                 ValueError,