If you already owned the name at the time of tm that "popped up" and you are the owner until the final payment is made, you shouldn't worry, as you couldn't in theory registered the name in bad faith.
The new owner, after he takes the ownership, might have issues, depending on how generic the name is, his use of it, etc.
The only thing you should probably watch for is that his usage while in escrow does not violate the trademark of the other party in the market/region/niche it is registered and reasonably known in.