diff --git a/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_platform_adapter.py b/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_platform_adapter.py
index 0dd7912e2..fb152484e 100644
--- a/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_platform_adapter.py
+++ b/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_platform_adapter.py
@@ -120,6 +120,12 @@ class AiocqhttpAdapter(Platform):
             abm.type = MessageType.FRIEND_MESSAGE
         if self.unique_session and abm.type == MessageType.GROUP_MESSAGE:
             abm.session_id = str(abm.sender.user_id) + "_" + str(event.group_id)
+        else:
+            abm.session_id = (
+                str(event.group_id)
+                if abm.type == MessageType.GROUP_MESSAGE
+                else abm.sender.user_id
+            )
         abm.message_str = ""
         abm.message = []
         abm.timestamp = int(time.time())