diff --git a/ytdlbot/tasks.py b/ytdlbot/tasks.py
index 7d54064..7ecc58e 100644
--- a/ytdlbot/tasks.py
+++ b/ytdlbot/tasks.py
@@ -317,14 +317,14 @@ def upload_processor(client, bot_msg, url, vp_or_fid: "typing.Any[str, pathlib.P
 def gen_cap(bm, url, video_path):
     chat_id = bm.chat.id
     user = bm.chat
-    if user is None:
-        user_info = ""
-    else:
+    try:
         user_info = "@{}({})-{}".format(
             user.username or "N/A",
             user.first_name or "" + user.last_name or "",
             user.id
         )
+    except Exception:
+        user_info = ""
 
     if isinstance(video_path, pathlib.Path):
         meta = get_metadata(video_path)
diff --git a/ytdlbot/ytdl_bot.py b/ytdlbot/ytdl_bot.py
index e8d4802..cacc02e 100644
--- a/ytdlbot/ytdl_bot.py
+++ b/ytdlbot/ytdl_bot.py
@@ -347,7 +347,7 @@ def periodic_sub_check():
                     logging.warning("User is blocked or deleted. %s", e)
                     vip.deactivate_user_subscription(uid)
                 except Exception as e:
-                    logging.error("Unknown error when sending message to user. %s", e)
+                    logging.error("Unknown error when sending message to user. %s", traceback.format_exc())
                 finally:
                     time.sleep(random.random() * 3)