langchain-ai/langgraph · error

`durability` has no effect when no checkpointer is present.

Error message

`durability` has no effect when no checkpointer is present.

What it means

Error "`durability` has no effect when no checkpointer is present." thrown in langchain-ai/langgraph.

Source

Thrown at libs/langgraph/langgraph/pregel/main.py:2803

                callback_manager.inheritable_handlers = [
                    h
                    for h in callback_manager.inheritable_handlers
                    if not isinstance(h, StreamMessagesHandlerV2)
                ]
            if "ls_integration" not in callback_manager.metadata:
                callback_manager.add_metadata({"ls_integration": "langgraph"})
            run_manager = callback_manager.on_chain_start(
                None,
                input,
                name=config.get("run_name", self.get_name()),
                run_id=config.get("run_id"),
            )
            graph_callback_manager = get_sync_graph_callback_manager_for_config(
                config,
                run_id=run_manager.run_id,
            )
            if checkpointer is None and durability is not None:
                warnings.warn(
                    "`durability` has no effect when no checkpointer is present.",
                )
            # set up subgraph checkpointing
            if self.checkpointer is True:
                ns = cast(str, config[CONF][CONFIG_KEY_CHECKPOINT_NS])
                config[CONF][CONFIG_KEY_CHECKPOINT_NS] = recast_checkpoint_ns(ns)
            # set up messages stream mode
            if "messages" in stream_modes:
                ns_ = cast(str | None, config[CONF].get(CONFIG_KEY_CHECKPOINT_NS))
                use_stream_messages_v2 = bool(
                    version == "v2" and config[CONF].get(CONFIG_KEY_STREAM_MESSAGES_V2)
                )
                messages_handler_cls = (
                    StreamMessagesHandlerV2
                    if use_stream_messages_v2
                    else StreamMessagesHandler
                )
                run_manager.inheritable_handlers.append(

View on GitHub (pinned to 38031739e5)

When it happens

Trigger: Thrown at libs/langgraph/langgraph/pregel/main.py:2803 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of langchain-ai/langgraph@38031739e5 (2026-08-26). Data as JSON: /api/errors/f8bc88d28b6e9d58. Report an issue: GitHub.