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We discover a large class of simple affine vertex algebras   $V_{k} ({\mathfrak{g}})$  , associated to basic Lie superalgebras   ${\mathfrak{g}}$   at non-admissible collapsing levels   $k$  , having exactly one irreducible   ${\mathfrak{g}}$  -locally finite module in the category   ${\mathcal O}$  . In the case when   ${\mathfrak{g}}$   is a Lie algebra, we prove a complete reducibility result for   $V_k({\mathfrak{g}})$  -modules at an arbitrary collapsing level. We also determine the generators of the maximal ideal in the universal affine vertex algebra   $V^k ({\mathfrak{g}})$   at certain negative integer levels. Considering some conformal embeddings in the simple affine vertex algebras   $V_{-1/2} (C_n)$   and   $V_{-4}(E_7)$  , we surprisingly obtain the realization of non-simple affine vertex algebras of types   $B$   and   $D$   having exactly one nontrivial ideal.

An Application of Collapsing Levels to the Representation Theory of Affine Vertex Algebras