  The coherent photonuclear production of a $\mathrm{J/}\psi$ vector meson at
the LHC has been computed using two different sets of solutions of the
impact-parameter dependent Balitsky-Kovchegov equation. The nuclear dipole
scattering amplitudes are obtained either from ($i$) solutions for this process
off proton targets coupled with a Glauber-Gribov prescription, or ($ii$) from
solutions obtained with an initial condition representing the nucleus. These
approaches predict different cross sections, which are compared with existing
data from ultra-peripheral collisions at the LHC. The latter approach seems to
better describe current measurements. Future LHC data should be precise enough
to select one of the two approaches as the correct one.
