Isn't an electron a singularity in this kind of sense? A mathematical point with some fields, and a certain mass.
Struggles with the Continuum, https://arxiv.org/abs/1609.01421
Lots of issues spring from unphysical assumptions like continuous quantities, point-like objects and infinities. Quantum mechanics was the first step towards more discrete formalisms, and I think future physics will take further steps in this direction to eliminate these issues.