Don't worry. If you don't need compensation, if the patent (which should be an appearance patent) applied by the other party is after your product is produced, and you can't pursue the product produced before, then he has no patent; If someone else's product applies for a patent in the future, you have to get the permission of the other party, otherwise it will be infringement.
Also, patent infringement requires evidence. As long as you prove that you don't know about it, they can't force you to pay compensation. But pay attention to the subsequent production.