The general principle of law, backed up by legion of authorities from the apex Court is that where a jurisdiction of a Court is challenged, the Court should expeditiously attend to the objection before taking any other further step in the proceedings. The rationale behind this practice is that the question of jurisdiction of Court is a radical and crucial question of competence, for if a Court has no jurisdiction to hear and determine a case, the totality of the proceedings, including orders made therein, are and remain a nullity, no matter how well conducted and brilliantly decided they might be. In other words, once an issue of jurisdiction is raised, until it is resolved, the Court cannot hear any other applications or any issue except to first determine whether it is possessed of the jurisdiction to determine the case. The Supreme Court has stated severally that it is an exhibition of wisdom to first determine when the Court has the jurisdiction to entertain the matter before it. See Yusuf vs. Egbe (1987) 2 NWLR (Pt. 56) 341, Dapianlong vs. Dariye (2007) 8 NWLR (Pt. 1036) 332, Ukwu vs. Bunge (1997) 8 NWLR (Pt. 518) 527, Nnonye vs. Anyichie (2005) 2 NWLR (Pt. 910) 623, A – G Anambra vs. A-G, Federation (1993) 6 NWLR (Pt. 321) 962.
— T. Akomolafe-Wilson, JCA. Onnoghen v. FRN (2019) – CA/A/44C/2019