From bc5391d7116465f5131884f3c61b3b45c5e988c8 Mon Sep 17 00:00:00 2001
From: yanyongyu <yanyongyu_1@126.com>
Date: Mon, 4 Jan 2021 13:27:49 +0800
Subject: [PATCH] :bug: ensure message is not empty

---
 nonebot/adapters/cqhttp/bot.py | 4 ++++
 1 file changed, 4 insertions(+)

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: