diff --git a/metagpt/roles/role.py b/metagpt/roles/role.py
index dbf800c03..62c8b7708 100644
--- a/metagpt/roles/role.py
+++ b/metagpt/roles/role.py
@@ -226,9 +226,9 @@ class Role:
         # Read unprocessed messages from the msg buffer.
         news = self._rc.msg_buffer.pop_all()
         # Store the read messages in your own memory to prevent duplicate processing.
+        old_messages = self._rc.memory.get()
         self._rc.memory.add_batch(news)
         # Filter out messages of interest.
-        old_messages = self._rc.memory.get()
         self._rc.news = [n for n in news if n.cause_by in self._rc.watch and n not in old_messages]
 
         # Design Rules: