Restitution must be set in an amount a defendant can actually make, and with those defendants who don't have much money, that frequently means that probation run its sentence but the defendant still owes money.
Typically, what will happen is that probation will violate you (they will have to do the paperwork) but as long as you have been making your restitution payment and having been ducking them, your probation will be extended for you to finish paying restitution. The US Supreme Court has basically held that it is no crime to be poor. Your situation is only a worry when you've got the money to pay restitution, but you you've been intentionally ducking your responsibility.
Let your lawyer know in advance and he can be there at the hearing, but if you've been doing what you should all along, this should work out fine for you.
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