Avatar shouldnt get interrupted anymore

I’ve been working with Heygen lately and I’m running into a small issue I hope the community can help with. Whenever the avatar is speaking, it tends to get interrupted or cut off before it finishes the sentence, when anyone is talking during the speech of the Avatar.
Does anyone know how to program Heygen (via API or otherwise) to ensure it completes its full speech without being interrupted?
Thanks in advance for any insights!