diff --git a/libs/checkpoint/langgraph/store/memory.py b/libs/checkpoint/langgraph/store/memory.py
index 8b08079895..2d002de9d3 100644
--- a/libs/checkpoint/langgraph/store/memory.py
+++ b/libs/checkpoint/langgraph/store/memory.py
@@ -1,5 +1,6 @@
 from collections import defaultdict
 from datetime import datetime, timezone
+from typing import Iterable
 
 from langgraph.store.base import BaseStore, GetOp, Item, Op, PutOp, Result, SearchOp
 
@@ -16,7 +17,7 @@ class InMemoryStore(BaseStore):
     def __init__(self) -> None:
         self._data: dict[tuple[str, ...], dict[str, Item]] = defaultdict(dict)
 
-    def batch(self, ops: list[Op]) -> list[Result]:
+    def batch(self, ops: Iterable[Op]) -> list[Result]:
         results: list[Result] = []
         for op in ops:
             if isinstance(op, GetOp):
@@ -63,5 +64,5 @@ def batch(self, ops: list[Op]) -> list[Result]:
                 results.append(None)
         return results
 
-    async def abatch(self, ops: list[Op]) -> list[Result]:
+    async def abatch(self, ops: Iterable[Op]) -> list[Result]:
         return self.batch(ops)
diff --git a/libs/checkpoint/tests/test_store.py b/libs/checkpoint/tests/test_store.py
index 807a5798ee..78b9f9e048 100644
--- a/libs/checkpoint/tests/test_store.py
+++ b/libs/checkpoint/tests/test_store.py
@@ -1,5 +1,6 @@
 import asyncio
 from datetime import datetime
+from typing import Iterable
 
 import pytest
 from pytest_mock import MockerFixture
@@ -14,18 +15,18 @@ async def test_async_batch_store(mocker: MockerFixture) -> None:
     abatch = mocker.stub()
 
     class MockStore(AsyncBatchedBaseStore):
-        def batch(self, ops: list[Op]) -> list[Result]:
+        def batch(self, ops: Iterable[Op]) -> list[Result]:
             raise NotImplementedError
 
-        async def abatch(self, ops: list[Op]) -> list[Result]:
+        async def abatch(self, ops: Iterable[Op]) -> list[Result]:
             assert all(isinstance(op, GetOp) for op in ops)
             abatch(ops)
             return [
                 Item(
                     value={},
                     scores={},
-                    id=op.id,
-                    namespace=op.namespace,
+                    id=getattr(op, "id", ""),
+                    namespace=getattr(op, "namespace", ()),
                     created_at=datetime(2024, 9, 24, 17, 29, 10, 128397),
                     updated_at=datetime(2024, 9, 24, 17, 29, 10, 128397),
                     last_accessed_at=datetime(2024, 9, 24, 17, 29, 10, 128397),