Seller financing concerns

[Evan Staats]

Hi everyone, I have a question in regards to seller financing. 
I have a seller interested in financing his house to me but he had one main concern. Since he is very unfamiliar with this process and this would by my first seller finance, the house is on the public market so he is contracted with a listing agent. he is curious how the commission for said agent is handled. 

I am not 100% positive on that answer so I was not able to speak intelligently on the topic. Could anyone answer this for me? 
Would the contract be void and the agent receive nothing or would the agent still receive their 6% at a closing with the title company?

Thank you!