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The quantization of the Friedmann-Robertson-Walker spacetime in the presenceof a negative cosmological constant was used in a recent paper to conclude thatthere are solutions that avoid singularities (big bang--big crunch) at thequantum level. We show that a proper study of their model{\sl does not prevent}the occurrence of singularities at the quantum level, in fact the quantumprobability of such event is larger than the classical one. Our numericalsimulations based on the powerful variational sinc collocation method (VSCM)also show that the precision of the results of that paper is much lower thanthe 20 significant digits reported by the authors.Comment: 7 pages, 3 figures, 2 tables Changes in the figure

Comment on “Quantization of Friedmann-Robertson-Walker spacetimes in the presence of a negative cosmological constant and radiation”