  The abundance of light nuclei and hyperons, that are produced in stellar
environments such as supernova or binary mergers, is calculated within a
relativistic mean-field model with density dependent couplings in low-density
matter. Five light nuclei are considered, together with three light
hyper-nuclei. We show that the presence of hyperons shifts the dissolution of
clusters to larger densities, and increases the amount of clusters. This effect
is larger the smaller the charge fraction, and the higher the temperature. The
abundance of hyperons is also affected by the cluster formation: neutral and
positively charged hyperons suffer a reduction, and the negatively charged ones
an increase. We also observe that the dissolution of the less-abundant clusters
occurs at larger densities due to smaller Pauli-blocking effects. Overall,
hyper-nuclei set in at temperatures above 25 MeV, and depending on the
temperature and chemical composition, they may be more abundant than
$\alpha$-particles, or even more abundant than other heavier clusters.
