SDK-Python: AttributeError: 'NoneType' object has no attribute 'get

[sagorbrur]

Hi,
I am getting this issue while integrating langfuse with langgraph. But the trace is coming rightly in the dashboard.
Here is the details

langfuse==2.56.2
langgraph==0.2.52
langchain-core==0.3.19

The error details:

{
    "message": "'NoneType' object has no attribute 'get'\nTraceback (most recent call last):\n  File \"/usr/local/lib/python3.12/site-packages/langfuse/callback/langchain.py\", line 302, in __generate_trace_and_parent\n    class_name = self.get_langchain_run_name(serialized, **kwargs)\n                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.12/site-packages/langfuse/callback/langchain.py\", line 169, in get_langchain_run_name\n    return serialized.get(\"name\", serialized.get(\"id\", [\"<unknown>\"])[-1])\n           ^^^^^^^^^^^^^^\nAttributeError: 'NoneType' object has no attribute 'get'",
    "level": "ERROR",
    "name": "langfuse",
    "timestamp": "2024-12-25T04:55:53.060356+00:00"
}

[marcklingen]

Turning this into an issue, thanks for reporting

#4834

[hassiebp]

@sagorbrur This is already fixed in the latest Python SDK version, please upgrade and try again 🙏🏾