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This warning is non-fatal: the streamed output is unaffected, only the tracing callback hits the missing key. Multiple reporters confirmed it went away after upgrading (langchain 0.2.14 / langchain-core 0.2.32 or later), so upgrading is the fix. As a temporary workaround, downgrading langchain-core to 0.2.22 silenced …
Problem outcome: unknown
Building a conversational RAG chatbot with create_retrieval_chain wrapped in RunnableWithMessageHistory (input_messages_key="input", history_messages_key="chat_history", output_messages_key="answer"). Calling astream() on the chain printed repeated warnings: Error in RootListenersTracer.on_chain_end callback: KeyError…
Problem outcome: unknown