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

An application of collapsing levels to the representation theory of affine vertex algebras