In old English law. The mistake of a clerk; a clerical error.. Vitium clerici nocere non debet. Jenk. Cent 23. A clerical error ought not to hurt Vitium est quod fugi debet, nisi, ra- tionem non invenias, moi legem sine ratione esse clames. Ellesm. Post. N. 86. It is a fault which ought to be avoided, that if you cannot discover the reason you should presently exclaim that the law is without reason.