It is settled law that the issue of jurisdiction can be raised at any stage of the proceedings even on appeal. Jurisdiction is regarded as a threshold issue and a life line for continuing any proceedings, that objection to jurisdiction ought to be taken at the earliest opportunity provided there are sufficient materials before the court to consider it and a decision reached on it before any other step in the proceedings is taken because if there is no jurisdiction the entire proceedings are a nullity no matter how well conducted. See Western Steel Works Ltd. v. Iron and Steel Workers Union (1986) 3 NWLR (Pt.30) 617; Barclays Bank of Nigeria v. C.B.N. (1976) 6 SC 175; Aloha v. Akereja (1988) 3 NWLR (Pt. 84) 508; Odofin v. Agu (1992) 3 NWLR (Pt. 229) 350: Jeric (Nig.) Ltd. v. U. B.N. Plc. (2000) 15 NWLR (Pt. 691) 447 and NDIC v. C.B.N. (2002) 7 NWLR (Pt. 766) 272. It is always in the interest of justice to raise the issue of jurisdiction at the earliest opportunity so as to save time and costs and to avoid a trial in nullity. See Petrojessica Enterprises Ltd. v. Leventis Technical Co. Ltd. (1992) 5 NWLR (Pt. 244) 675, at 693 where Belgore, JSC, said: “It is desirable that preliminary objection be raised early on issue of jurisdiction, but once it is apparent to any party that the court may not have jurisdiction it can be raised even viva-voce as in this case. It is always in the interest of justice to raise issue of jurisdiction so as to save time and costs and to avoid a trial in nullity.” See also Enweremadu v. Ohajuruka (supra) at 478 when Ikongbeh, JCA held inter alia: “Once the jurisdiction of court is called into question, it becomes powerless to do anything in a cause or matter before it other than to inquire into the existence or lack of jurisdiction to entertain the cause or matter, it cannot do anything in furtherance of the cause or matter.”
— Abba Aji, J.C.A. Secondi Bogban & Ors. V. Motor Diwhre & Ors. (CA/B/88/2003, 20 MAY 2005)