In their arguments on the sole issue, both learned counsel for the parties correctly stated the often-stated principle of law in determining whether or not a court has jurisdiction to entertain the subject matter of a suit. That is that the writ of summons and the Statement of claim must be carefully examined. See OPITI v. OGBEIWI (1992) 4 NWLR (pt.234) 184 at 195; ADEYEMI v OPEYORI (1976) 9-10 SC.31 at 49. It is well settled that where there is no jurisdiction to hear and determine a cause or matter, everything done in such want of jurisdiction is a nullity. See MUSTAPHA v. GOVERNOR OF LAGOS STATE (1987) NWLR (pt.58).
— S. Galadima JSC. Adetona & Ors. v Igele (2011) – SC.237/2005