Can I Wholesale a house that's already under contract w/ an agent

[Beni Fernand]

Hi there! I'm a new real estate investor. My agent sent me a townhouse listed for $69,000 no rehab needed. I went to view the property and the owner was still living there. She told me that the house was paid for, free and clear. I directly talk to the owner and emailed her a formal offer for $50,000 all cash.  Her agent (the listing agent) emailed me back and told me that they will accept the offer ( No counter).  My question is, can I put the house under contract with an agent involved already? or should the owner cancel their contract with the listing agent first.