Before you get a lawyer, have you tried telling them you don't like the clause? You're about the partner up with these people for (hopefully) many years. Start on the right foot and have a frank discussion with them and politely ask them to remove it from the agreement.
It's kind of a stupid clause, but it's likely their because they hired a lawyer and a lawyer is going to hand them boilerplate stuff that protects their clients... Not necessarily what's fair/normal.
It's kind of a stupid clause, but it's likely their because they hired a lawyer and a lawyer is going to hand them boilerplate stuff that protects their clients... Not necessarily what's fair/normal.