N.J. Stat. § 40:55D-23.2
If the planning board lacks a quorum because any of its regular or alternate members is prohibited by subsection b. of section 14 of P.L. 1975, c.291 (C.40:55D-23) or section 13 of P.L. 1979, c.216 (C.40:55D-23.1) from acting on a matter due to the member's personal or financial interests therein, regular members of the board of adjustment shall be called upon to serve, for that matter only, as temporary members of the planning board in order of seniority of continuous service to the board of adjustment until there are the minimum number of members necessary to constitute a quorum to act upon the matter without any personal or financial interest therein, whether direct or indirect. If a choice has to be made between regular members of equal seniority, the chairman of the board of adjustment shall make the choice.
N.J.S. § 40:55D-23.2