Presiding at sitting of the National Assembly and at joint sittings
Section 53 · 1999 Constitution (2004 edition)
What Constitution says
(1) At any sitting of the National Assembly - (a) in the case of the Senate, the President of the Senate shall preside, and in his absence the Deputy President shall preside; and (b) in the case of the House of Representatives, the Speaker of that House shall preside, and in his absence the Deputy Speaker shall preside. (2) At any joint sitting of the Senate and House of Representatives - (a) the President of Senate shall preside, and in his absence the Speaker of the House of Representatives shall preside; and (b) in the absence of the persons mentioned in paragraph (a) of this subsection, the Deputy President of the Senate shall preside, and in his absence the Deputy Speaker of the House of Representatives shall preside. (3) In the absence of the persons mentioned in the foregoing provisions of this section, such member of the Senate or the House of Representatives or of the joint sitting, as the case may be, as the Senate or the House of Representatives or the joint sitting may elect for that purpose shall preside.
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 44. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections