Streaming a response from onProgress return duplicates

[Gerovinka]

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Environment details

I'm doing a test AWS Lambda function in Node.js 18.x

Describe the Bug

I apologize, can you suggest how to solve my problem. I have added data streaming directly from your onProgress, but when I test how the function works, I sometimes get duplicate messages. My code looks like this:
const res = await api.sendMessage(question, {
systemMessage: role,
onProgress: (partialResponse) => {
responseText = partialResponse.text;
responseStream.write(responseText);
}
})
During testing, I sometimes get duplicates of the following kind: "The Three of PentaclesThe Three of Pentacles suggestsThe Three of Pentacles suggests that"

Could you please advise me if I did the right thing to add the data return directly from your 'onProgress' or do I need to modify my code