Node has been removed from the graph.

[richTheCreator]

Checked other resources

• This is a bug, not a usage question. For questions, please use GitHub Discussions.
• I added a clear and detailed title that summarizes the issue.
• I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
• I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue.

Example Code

Create a new langgraph project via langgraph new

Description

State is not persisting when shutting down the server then starting it again.

First run langgraph dev

You will see state is working as intended in langgraph studio and in Agent Chat UI.

Stop the server. Restart it.

You will notice that state is now empty for any previous thread. Messages and anything else in state is now empty and a message shows next to each node "Node has been removed from the graph."

After server restarted:

I updated the langgraph cli recently and other deps then this started happening. I have another graph on older deps and it is setup very similar but does not have this problem.

Additionally, using rerun from here does not work either and will cause the graph to not return a response at all.

System Info

System Information

OS: Darwin
OS Version: Darwin Kernel Version 24.3.0: Thu Jan 2 20:24:16 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6000
Python Version: 3.12.9 | packaged by Anaconda, Inc. | (main, Feb 6 2025, 12:55:12) [Clang 14.0.6 ]

Package Information

langchain_core: 0.3.51
langchain: 0.3.23
langchain_community: 0.3.17
langsmith: 0.3.24
langchain_anthropic: 0.3.7
langchain_fireworks: 0.2.7
langchain_google_genai: 2.0.9
langchain_openai: 0.3.4
langchain_text_splitters: 0.3.8
langgraph_api: 0.0.46
langgraph_cli: 0.1.89
langgraph_license: Installed. No version info available.
langgraph_sdk: 0.1.61
langgraph_storage: Installed. No version info available.

Optional packages not installed

langserve

Other Dependencies

aiohttp: 3.11.12
aiohttp<4.0.0,>=3.8.3: Installed. No version info available.
anthropic<1,>=0.45.0: Installed. No version info available.
async-timeout<5.0.0,>=4.0.0;: Installed. No version info available.
blockbuster: 1.5.24
click: 8.1.8
cloudpickle: 3.1.1
cryptography: 43.0.3
dataclasses-json<0.7,>=0.5.7: Installed. No version info available.
filetype: 1.2.0
fireworks-ai: 0.15.12
google-generativeai: 0.8.4
httpx: 0.28.1
httpx-sse<1.0.0,>=0.4.0: Installed. No version info available.
jsonpatch<2.0,>=1.33: Installed. No version info available.
jsonschema-rs: 0.25.1
langchain-anthropic;: Installed. No version info available.
langchain-aws;: Installed. No version info available.
langchain-azure-ai;: Installed. No version info available.
langchain-cohere;: Installed. No version info available.
langchain-community;: Installed. No version info available.
langchain-core<1.0.0,>=0.3.34: Installed. No version info available.
langchain-core<1.0.0,>=0.3.51: Installed. No version info available.
langchain-deepseek;: Installed. No version info available.
langchain-fireworks;: Installed. No version info available.
langchain-google-genai;: Installed. No version info available.
langchain-google-vertexai;: Installed. No version info available.
langchain-groq;: Installed. No version info available.
langchain-huggingface;: Installed. No version info available.
langchain-mistralai;: Installed. No version info available.
langchain-ollama;: Installed. No version info available.
langchain-openai;: Installed. No version info available.
langchain-perplexity;: Installed. No version info available.
langchain-text-splitters<1.0.0,>=0.3.8: Installed. No version info available.
langchain-together;: Installed. No version info available.
langchain-xai;: Installed. No version info available.
langchain<1.0.0,>=0.3.18: Installed. No version info available.
langgraph: 0.3.25
langgraph-checkpoint: 2.0.24
langsmith-pyo3: Installed. No version info available.
langsmith<0.4,>=0.1.125: Installed. No version info available.
langsmith<0.4,>=0.1.17: Installed. No version info available.
numpy<2,>=1.26.4;: Installed. No version info available.
numpy<3,>=1.26.2;: Installed. No version info available.
openai: 1.61.1
openai-agents: Installed. No version info available.
openai<2.0.0,>=1.58.1: Installed. No version info available.
opentelemetry-api: Installed. No version info available.
opentelemetry-exporter-otlp-proto-http: Installed. No version info available.
opentelemetry-sdk: Installed. No version info available.
orjson: 3.10.16
packaging: 24.2
packaging<25,>=23.2: Installed. No version info available.
pydantic: 2.11.2
pydantic-settings<3.0.0,>=2.4.0: Installed. No version info available.
pydantic<3.0.0,>=2.5.2;: Installed. No version info available.
pydantic<3.0.0,>=2.7.4: Installed. No version info available.
pydantic<3.0.0,>=2.7.4;: Installed. No version info available.
pyjwt: 2.10.1
pytest: Installed. No version info available.
python-dotenv: 1.0.1
PyYAML>=5.3: Installed. No version info available.
requests: 2.32.3
requests-toolbelt: 1.0.0
requests<3,>=2: Installed. No version info available.
rich: Installed. No version info available.
SQLAlchemy<3,>=1.4: Installed. No version info available.
sse-starlette: 2.1.3
starlette: 0.45.3
structlog: 24.4.0
tenacity: 9.1.2
tenacity!=8.4.0,<10,>=8.1.0: Installed. No version info available.
tenacity!=8.4.0,<10.0.0,>=8.1.0: Installed. No version info available.
tiktoken<1,>=0.7: Installed. No version info available.
typing-extensions>=4.7: Installed. No version info available.
uvicorn: 0.34.0
watchfiles: 1.0.4
zstandard: 0.23.0