diff --git a/plugins/group_member_change/main.py b/plugins/group_member_change/main.py
index 50a1f72..b5a7c69 100644
--- a/plugins/group_member_change/main.py
+++ b/plugins/group_member_change/main.py
@@ -65,6 +65,8 @@ class GroupMemberChangePlugin(MessagePluginInterface):
 
         content = str(message.get("content", "")).strip()
         self.LOG.info(f"插件执行： {self.name}：{content}")
+        if not content or "<sysmsg" not in content:
+            return False, "非系统消息"
         sender = message.get("sender")
         roomid = message.get("roomid", "")
         gbm: GroupBotManager = message.get("gbm")
@@ -75,8 +77,8 @@ class GroupMemberChangePlugin(MessagePluginInterface):
             return False, "没有权限"
 
         xml_content = str(content).strip().replace("\n", "").replace("\t", "")
-        root = ET.fromstring(xml_content)
 
+        root = ET.fromstring(xml_content)
         if root.tag != "sysmsg":
             return False, "非本次需要处理消息"