Summary: It was noted in [I. Demir et al., Commun. Algebra 45, No. 3, 1012–1018 (2017; Zbl 1418.17007); N. Ismailov et al., Can. Math. Bull. 62, No. 3, 539–549 (2019; Zbl 1477.17020)] that there is a 4-dimensional nilpotent Leibniz algebra that is not included in the classification obtained in [S. Albeverio et al., Extr. Math. 21, No. 3, 197–210 (2006; Zbl 1137.17002)]. The construction of the graph of degenerations (see [the authors, Linear Multilinear Algebra 66, No. 4, 704–716 (2018; Zbl 1472.17100)]) is based on the classification of Albeverio et al. [loc. cit.] and for this reason, this graph does not contain the mentioned algebra. This omission and some other small inaccuracies are corrected in the present corrigendum.