Gpt-oss-120b ignoring tools

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Hello, so I’m currently getting the following issue using gpt-oss-20b:
”Tool choice is none, but model called a tool”
→ my current model settings:

        response_stream = await self.client.chat.completions.create(
            model=self.model_name,
            messages=groq_messages,
            temperature=0.2,
            max_completion_tokens=160,
            reasoning_effort="low",
            stream=True,
            tools=None,
            stop=None
        )

So why is it trying to make a call to tools?

part of the error trace

python3.11/site-packages/groq/_streaming.py", line 147, in __aiter__
    async for item in self._iterator:
python3.11/site-packages/groq/_streaming.py", line 193, in __stream__
    raise APIError(
groq.APIError: Tool choice is none, but model called a tool
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