PRINCIPLE STATEMENT

An error in law which has occasioned no miscarriage of justice is immaterial and may not affect the final decision of a court; after careful consideration, if the error did not occasion miscarriage of justice, reversal is unwarranted.

RATIO DECIDENDI (SOURCE)

Per Iguh, J.S.C., in Oladejo Adewuyi Ajuwon v. Fadele Akanni & Ors (1993) NLC-361987(SC) at pp. 23-24; Paras B--C.
"An error in law which has occasioned no miscarriage of justice is immaterial and may not affect the final decision of a court... I have given this matter a most careful consideration and have come to the conclusion that the said error in law complained of did not occasion any miscarriage of justice."
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EXPLANATION / SCOPE

Not every legal error requires reversal—only errors causing miscarriage of justice. “Miscarriage of justice” means the error affected the outcome or denied a party fair proceedings. Harmless errors—those not affecting the result—are immaterial. This principle promotes efficiency and finality: judgments substantially correct should not be reversed for technical errors that didn’t affect justice. Courts must carefully analyze whether errors were prejudicial. If the same result would have obtained without the error, or if overwhelming evidence supports the decision independent of the error, reversal is inappropriate. This doctrine applies proviso-like analysis: the error occurred, but was it fatal? The principle balances error correction against finality and avoids retrials for errors that didn’t matter.

CASES APPLYING THIS PRINCIPLE