Election of Governor: general
Section 178(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) Where in an election to the office of Governor of a State one of the two or more candidates nominated for the election is the only candidate after the close of nomination, by reason of the disqualification, withdrawal, incapacitation, disappearance or death of the other candidates, the Independent National Electoral Commission shall extend the time for nomination.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 83. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections