Comment on: 'On the Klein-Gordon oscillator subject to a Coulomb-type potential'. Ann. Phys. 355 (2015) 48 [arXiv:arXiv:1411.6988]

We analyze the conclusions of the influence of a Coulomb-type potential on the Klein-Gordon oscillator. We show that the truncation method proposed by the authors do not yield all the eigenvalues of the radial equation but just one of them for a particular value of a model parameter. Besides, the existence of allowed oscillator frequencies that depend on the quantum numbers is an artifact of the truncation method.