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[Bug]: request reward model report 500 Internal Server Error #10444

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@hrdxwandg

Description

@hrdxwandg

Your current environment

The output of `python collect_env.py`
Your output of `python collect_env.py` here

Model Input Dumps

No response

🐛 Describe the bug

following the instruction #8700 (comment) , the reward model https://huggingface.co/nvidia/Llama-3.1-Nemotron-70B-Reward-HF is a LlamaForCausalLM model, so I serve it with vllm add parameter --task embedding.

when I send a request, it encounter en error:
INFO: "POST /v1/embeddings HTTP/1.1" 500 Internal Server Error
ERROR 11-19 17:55:16 engine.py:135] TypeError("object of type 'NoneType' has no len()")
and then the server terminated

the shell script:

curl http://host:port/v1/embeddings \  
        -H "Content-Type: application/json" \
        -d '{
         "model": "Llama-3.1-Nemotron-70B-Reward-HF",
         "input": "Your text string goes here"                                                      
}'

or use python code same as https://github.com/vllm-project/vllm/blob/main/examples/openai_embedding_client.py

has the same error

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