  Although General Relativity predicts the presence of a singularity inside of
a Black Hole, it is not a complete theory of gravity. A real structure of a
Black Hole interior near an expected singularity depends on the UV completion
of gravity. In this paper, we establish that the question whether singular
spherically symmetric solutions are absent is governed by the functional form
of a non-perturbative graviton propagator. We explicitly show in a framework of
a ghost-free infinite derivative gravity that for the graviton propagator of an
exponential form favored by the unitarity a singularity is not possible unless
an unphysical situation when the total mass of the Black Hole is infinite is
considered.
