  PSZ2 G091.83+26.11 is a massive galaxy cluster with M500 = 7.43 x 10^14 Msun
at z = 0.822. This object exhibits a complex morphology with a clear bimodality
observed in X-rays. However, it was detected and analysed in the Planck sample
as a single, spherical cluster following a universal profile [1]. This model
can lead to miscalculations of thermodynamical quantities, like the pressure
profile. As future multiwavelength cluster experiments will detect more and
more objects at higher redshifts (where we expect the fraction of merging
objects to be higher), it is crucial to quantify this systematic effect. In
this work, we use high-resolution observations of PSZ2 G091.83+26.11 by the
NIKA2 camera to integrate the morphological characteristics of the cluster in
our modelling. This is achieved by fitting a two-halo model to the SZ image and
then by reconstruction of the resulting projected pressure profile. We then
compare these results with the spherical assumption.
