Response messages from OpenAI API without content

Question

Sometimes getting message from API without content, like below. Never had problems like this with original openai API.
{"id":"chatcmpl-7n20Z6UmlcR2rCdODY0TX3fEASA8T","object":"chat.completion","created":1691920147,"model":"gpt-35-turbo","choices":[{"index":0,"finish_reason":"stop","message":{"role":"assistant"}}],"usage":{"prompt_tokens":1075,"total_tokens":1075}}

normally it goes
"message":{"role":"assistant","content":"response content."}}