diff --git a/metagpt/schema.py b/metagpt/schema.py
index 758149efa..9916bffff 100644
--- a/metagpt/schema.py
+++ b/metagpt/schema.py
@@ -163,8 +163,14 @@ class Message(BaseModel):
     def load(val):
         """Convert the json string to object."""
         try:
-            d = json.loads(val)
-            return Message(**d)
+            m = json.loads(val)
+            id = m.get("id")
+            if "id" in m:
+                del m["id"]
+            msg = Message(**m)
+            if id:
+                msg.id = id
+            return msg
         except JSONDecodeError as err:
             logger.error(f"parse json failed: {val}, error:{err}")
         return None
diff --git a/tests/metagpt/test_role.py b/tests/metagpt/test_role.py
index 8fac2503c..cf09d6f0a 100644
--- a/tests/metagpt/test_role.py
+++ b/tests/metagpt/test_role.py
@@ -88,13 +88,13 @@ async def test_react():
 @pytest.mark.asyncio
 async def test_msg_to():
     m = Message(content="a", send_to=["a", MockRole, Message])
-    assert m.send_to == set({"a", get_class_name(MockRole), get_class_name(Message)})
+    assert m.send_to == {"a", get_class_name(MockRole), get_class_name(Message)}
 
     m = Message(content="a", cause_by=MockAction, send_to={"a", MockRole, Message})
-    assert m.send_to == set({"a", get_class_name(MockRole), get_class_name(Message)})
+    assert m.send_to == {"a", get_class_name(MockRole), get_class_name(Message)}
 
     m = Message(content="a", send_to=("a", MockRole, Message))
-    assert m.send_to == set({"a", get_class_name(MockRole), get_class_name(Message)})
+    assert m.send_to == {"a", get_class_name(MockRole), get_class_name(Message)}
 
 
 if __name__ == "__main__":
diff --git a/tests/metagpt/test_schema.py b/tests/metagpt/test_schema.py
index 51ebd5baa..40b18e0f4 100644
--- a/tests/metagpt/test_schema.py
+++ b/tests/metagpt/test_schema.py
@@ -16,7 +16,6 @@ from metagpt.schema import AIMessage, Message, SystemMessage, UserMessage
 from metagpt.utils.common import get_class_name
 
 
-@pytest.mark.asyncio
 def test_messages():
     test_content = "test_message"
     msgs = [
@@ -30,7 +29,6 @@ def test_messages():
     assert all([i in text for i in roles])
 
 
-@pytest.mark.asyncio
 def test_message():
     m = Message("a", role="v1")
     v = m.dump()
@@ -61,7 +59,6 @@ def test_message():
     assert m.content == "b"
 
 
-@pytest.mark.asyncio
 def test_routes():
     m = Message("a", role="b", cause_by="c", x="d", send_to="c")
     m.send_to = "b"
diff --git a/tests/metagpt/utils/test_token_counter.py b/tests/metagpt/utils/test_token_counter.py
index 479ccc22d..acb99d717 100644
--- a/tests/metagpt/utils/test_token_counter.py
+++ b/tests/metagpt/utils/test_token_counter.py
@@ -15,7 +15,7 @@ def test_count_message_tokens():
         {"role": "user", "content": "Hello"},
         {"role": "assistant", "content": "Hi there!"},
     ]
-    assert count_message_tokens(messages) == 17
+    assert count_message_tokens(messages) == 15
 
 
 def test_count_message_tokens_with_name():
@@ -67,3 +67,7 @@ def test_count_string_tokens_gpt_4():
 
     string = "Hello, world!"
     assert count_string_tokens(string, model_name="gpt-4-0314") == 4
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-s"])