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graph.invoke() / graph.stream() raise AttributeError when config is not a mapping #1143

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opened 2026-02-20 17:43:14 -05:00 by yindo · 1 comment
yindo commented 2026-02-20 17:43:14 -05:00
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Originally created by @lchl21 on GitHub (Feb 11, 2026).

Checked other resources

  • This is a bug, not a usage question.
  • I added a clear and descriptive title that summarizes this issue.
  • I used the GitHub search to find a similar question and didn't find it.
  • I am sure that this is a bug in LangGraph rather than my code.
  • The bug is not resolved by updating to the latest stable version of LangGraph (or the specific integration package).
  • This is not related to the langchain-community package.
  • I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.

Reproduction Steps / Example Code (Python)

import operator
from typing import Annotated, TypedDict
from langgraph.graph import StateGraph, START, END

class State(TypedDict):
    messages: Annotated[list[str], operator.add]

def node(name: str):
    def _node(state: State):
        return {"messages": [f"entered {name} node"]}
    return _node

builder = StateGraph(State)
builder.add_node("one", node("one"))
builder.add_node("two", node("two"))
builder.add_edge(START, "one")
builder.add_edge("one", "two")
builder.add_edge("two", END)
graph = builder.compile()

# Valid config works
graph.invoke({"messages": []}, config={"configurable": {"thread_id": "1"}})

# Invalid config (string instead of dict)
graph.invoke(None, config="invalid_config")

Error Message and Stack Trace (if applicable)

File "/Users/macbook/wlnwun3/lang_xxx.py", line 25, in <module>
    graph.invoke(None, config="invalid_config")
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/macbook/wlnwun3/.venv-lg108/lib/python3.13/site-packages/langgraph/pregel/main.py", line 3071, in invoke
    for chunk in self.stream(
                 ~~~~~~~~~~~^
        input,
        ^^^^^^
    ...<10 lines>...
        **kwargs,
        ^^^^^^^^^
    ):
    ^
  File "/Users/macbook/wlnwun3/.venv-lg108/lib/python3.13/site-packages/langgraph/pregel/main.py", line 2499, in stream
    config = ensure_config(self.config, config)
  File "/Users/macbook/wlnwun3/.venv-lg108/lib/python3.13/site-packages/langgraph/_internal/_config.py", line 302, in ensure_config
    for k, v in config.items():
                ^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'items'

Description

When calling graph.invoke() or graph.stream() with a config argument that is not a mapping (e.g., a string), LangGraph raises an internal AttributeError: 'str' object has no attribute 'items'

The exception originates from:
langgraph/_internal/_config.py
for k, v in config.items():

This indicates that the framework assumes config is a mapping without validating its type.

System Info

System Information

OS: Darwin
OS Version: Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:40 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T8132
Python Version: 3.13.5 | packaged by Anaconda, Inc. | (main, Jun 12 2025, 11:23:37) [Clang 14.0.6 ]

Package Information

langchain_core: 1.2.11
langsmith: 0.7.1
langgraph_sdk: 0.3.5

Optional packages not installed

langserve

Other Dependencies

httpx: 0.28.1
jsonpatch: 1.33
orjson: 3.11.7
packaging: 26.0
pydantic: 2.12.5
pyyaml: 6.0.3
requests: 2.32.5
requests-toolbelt: 1.0.0
tenacity: 9.1.4
typing-extensions: 4.15.0
uuid-utils: 0.14.0
xxhash: 3.6.0
zstandard: 0.25.0

Originally created by @lchl21 on GitHub (Feb 11, 2026). ### Checked other resources - [x] This is a bug, not a usage question. - [x] I added a clear and descriptive title that summarizes this issue. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangGraph rather than my code. - [x] The bug is not resolved by updating to the latest stable version of LangGraph (or the specific integration package). - [x] This is not related to the langchain-community package. - [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS. ### Reproduction Steps / Example Code (Python) ```python import operator from typing import Annotated, TypedDict from langgraph.graph import StateGraph, START, END class State(TypedDict): messages: Annotated[list[str], operator.add] def node(name: str): def _node(state: State): return {"messages": [f"entered {name} node"]} return _node builder = StateGraph(State) builder.add_node("one", node("one")) builder.add_node("two", node("two")) builder.add_edge(START, "one") builder.add_edge("one", "two") builder.add_edge("two", END) graph = builder.compile() # Valid config works graph.invoke({"messages": []}, config={"configurable": {"thread_id": "1"}}) # Invalid config (string instead of dict) graph.invoke(None, config="invalid_config") ``` ### Error Message and Stack Trace (if applicable) ```shell File "/Users/macbook/wlnwun3/lang_xxx.py", line 25, in <module> graph.invoke(None, config="invalid_config") ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/macbook/wlnwun3/.venv-lg108/lib/python3.13/site-packages/langgraph/pregel/main.py", line 3071, in invoke for chunk in self.stream( ~~~~~~~~~~~^ input, ^^^^^^ ...<10 lines>... **kwargs, ^^^^^^^^^ ): ^ File "/Users/macbook/wlnwun3/.venv-lg108/lib/python3.13/site-packages/langgraph/pregel/main.py", line 2499, in stream config = ensure_config(self.config, config) File "/Users/macbook/wlnwun3/.venv-lg108/lib/python3.13/site-packages/langgraph/_internal/_config.py", line 302, in ensure_config for k, v in config.items(): ^^^^^^^^^^^^ AttributeError: 'str' object has no attribute 'items' ``` ### Description When calling graph.invoke() or graph.stream() with a config argument that is not a mapping (e.g., a string), LangGraph raises an internal AttributeError: 'str' object has no attribute 'items' The exception originates from: langgraph/_internal/_config.py for k, v in config.items(): This indicates that the framework assumes config is a mapping without validating its type. ### System Info System Information ------------------ > OS: Darwin > OS Version: Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:40 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T8132 > Python Version: 3.13.5 | packaged by Anaconda, Inc. | (main, Jun 12 2025, 11:23:37) [Clang 14.0.6 ] Package Information ------------------- > langchain_core: 1.2.11 > langsmith: 0.7.1 > langgraph_sdk: 0.3.5 Optional packages not installed ------------------------------- > langserve Other Dependencies ------------------ > httpx: 0.28.1 > jsonpatch: 1.33 > orjson: 3.11.7 > packaging: 26.0 > pydantic: 2.12.5 > pyyaml: 6.0.3 > requests: 2.32.5 > requests-toolbelt: 1.0.0 > tenacity: 9.1.4 > typing-extensions: 4.15.0 > uuid-utils: 0.14.0 > xxhash: 3.6.0 > zstandard: 0.25.0
yindo added the bug label 2026-02-20 17:43:14 -05:00
yindo closed this issue 2026-02-20 17:43:14 -05:00
yindo commented 2026-02-20 17:43:14 -05:00
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@hinthornw commented on GitHub (Feb 11, 2026):

This isn't a bug.

@hinthornw commented on GitHub (Feb 11, 2026): This isn't a bug.
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Reference: langchain-ai/langgraph#1143
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