diff --git a/libs/langgraph/langgraph/pregel/__init__.py b/libs/langgraph/langgraph/pregel/__init__.py
index 7fd3ce646..b249927b5 100644
--- a/libs/langgraph/langgraph/pregel/__init__.py
+++ b/libs/langgraph/langgraph/pregel/__init__.py
@@ -494,7 +494,9 @@ class Pregel(PregelProtocol):
                 saved.metadata.get("step", -1) + 1,
                 for_execution=True,
                 store=self.store,
-                checkpointer=self.checkpointer or None,
+                checkpointer=self.checkpointer
+                if isinstance(self.checkpointer, BaseCheckpointSaver)
+                else None,
                 manager=None,
             )
             # get the subgraphs
@@ -606,7 +608,9 @@ class Pregel(PregelProtocol):
                 saved.metadata.get("step", -1) + 1,
                 for_execution=True,
                 store=self.store,
-                checkpointer=self.checkpointer or None,
+                checkpointer=self.checkpointer
+                if isinstance(self.checkpointer, BaseCheckpointSaver)
+                else None,
                 manager=None,
             )
             # get the subgraphs