diff --git a/update_db.py b/update_db.py
index 036f12f..66d190c 100644
--- a/update_db.py
+++ b/update_db.py
@@ -34,7 +34,7 @@ class VideoResult (TypedDict):
     contentId:      str
     title:          str
     tags:           str
-    description:    str
+    description:    str | None
     viewCounter:    int
     startTime:      str
 
@@ -96,6 +96,8 @@ def update_tables (
                           title         = datum['title'],
                           description   = datum['description'],
                           uploaded_at   = datetime.fromisoformat (datum['startTime']))
+        if video.description is None:
+            video.description = ''
         video_dao.upsert (video, False)
         if video.id_ is not None:
             video_ids.append (video.id_)