diff --git a/metagpt/roles/role.py b/metagpt/roles/role.py
index 8edbdfca1..b9fde7d05 100644
--- a/metagpt/roles/role.py
+++ b/metagpt/roles/role.py
@@ -400,7 +400,7 @@ class Role(BaseModel):
         observed_pure = [msg.dict(exclude={"id": True}) for msg in observed]
         existed_pure = [msg.dict(exclude={"id": True}) for msg in existed]
         for idx, new in enumerate(observed_pure):
-            if (new["cause_by"] in self._rc.watch and new not in existed_pure) or (not self._rc.watch):
+            if new["cause_by"] in self._rc.watch and new not in existed_pure:
                 news.append(observed[idx])
         return news