N.J. Stat. § 2A:17-56.69
If a child support obligation is terminated by operation of law pursuant to section 1 of P.L. 2015, c. 223(C.2A:17-56.67), any arrearages that have accrued prior to the date of the termination shall remain due and enforceable. If the person responsible for paying child support for a child owes child support arrearages at the time a child support obligation is terminated and there are no other children being supported under the same order, the amount to be paid to satisfy the arrearage shall be the sum of the recurring child support obligation in effect immediately prior to the effective date of the termination plus any arrears repayment obligation in effect immediately prior to the effective date of the termination, unless otherwise ordered by the court.
For child support orders that are being administered by the Probation Division of the Superior Court, the Probation Division shall continue to enforce and collect the arrearages until they are paid in full or the court, in accordance with State and federal law and regulations and the Rules of Court, as applicable, terminates the Probation Division's supervision of the support order.
N.J.S. § 2A:17-56.69