An eerie note of caution from two papers of Mostafa M. A. Khater et al. and Sadaf Bibi et al. [Results in Physics, 7 (2017) 2325-2333 and 4440-4450.]

This note concerns the doubtful Khater method included in the above two papers. We show by simple calculation that Khater method is not true. The solutions of the proposed nonlinear equations in the above two papers are all not true too.