diff --git a/nonebot/adapters/cqhttp/bot.py b/nonebot/adapters/cqhttp/bot.py
index 1aff6d5d..d62ff829 100644
--- a/nonebot/adapters/cqhttp/bot.py
+++ b/nonebot/adapters/cqhttp/bot.py
@@ -82,6 +82,10 @@ def _check_at_me(bot: "Bot", event: "Event"):
     if not isinstance(event, MessageEvent):
         return
 
+    # ensure message not empty
+    if not event.message:
+        event.message.append(MessageSegment.text(""))
+
     if event.message_type == "private":
         event.to_me = True
     else: