Erratum to: Optical properties of Kerr–Newman spacetime in the presence of plasma Gulmina Zaman Babar, Abdullah Zaman Babar and Farruh Atamurotov Eur. Phys. J. C, 82 5 (2022) 403 Published online: 04 May 2022 DOI: 10.1140/epjc/s10052-022-10326-9