Corrigendum to: “Lusternik–Schnirelman and Morse Theory for the Van der Waals–Cahn–Hilliard equation with volume constraint” [Nonlinear Anal. 220 (2022) 112851]

The statement and the proof of a technical lemma in Benci et al. (2022) turn out to be incorrect. Nonetheless, the main result of the paper remains valid, and in this Corrigendum we give an alternative approach which provides a correct proof of Benci et al. (2022, Theorem 2.1).