This court has spelt out in Madukolu v. Nkemdilim (supra) the circumstances where proceedings can be regarded as a nullity. These are where 1. The court is not properly constituted as regards numbers and qualification of the members of the bench 2. The subject matter of the action is not within the jurisdiction of the court 3. The case before the court is not initiated by due process of law, or that there is a condition precedent to the exercise of jurisdiction. The third of the conditions prescribed, and which is relied upon by the appellant in this appeal is where the action comes before the court of trial without due process of law. There is non-compliance with due process of law when the procedural requirements have not been complied with, or the preconditions for the exercise of jurisdiction have not been complied with. In such a circumstance, as in the other two cases, the defect is fatal to the competence of the trial court to entertain the suit. This is because the court will in such a situation not be seised with jurisdiction in respect of the action.
— Karibe-Whyte, JSC. Saude v. Abdullahi (1989) – SC.197/1987