Literally it reads, And a matter there was not to them with man [adam].
This is how it appears in the Hebrew text, which the ESV in essence follows. But it seems that this reading is the result of a scribal misreading, where adam was originally aram. Indeed, the Septuagint (the Greek translation of the Old Testament) and the Syriac version have Aram
instead of man.
Thus, Laish had no dealings with Aram.
This does fit with the ancient context: the Arameans were their closest neighbours to the east, located across the Anti-Lebanon mountain range. Laish preferred to have nothing to do with them.1
7 Then the five men departed and came to Laish and saw the people who were there, how they lived in security, after the manner of the Sidonians, quiet and unsuspecting, lacking nothing that is in the earth and possessing wealth, and how they were far from the Sidonians and had no dealings with anyone.