This is a recent regression. Happens when using either baloo inxeding, or the filesystem crawling indexing. Will bisect shortly.
Caused by: 9034ae2536882f428c818ae4098cada366a5bbaf is the first bad commit commit 9034ae2536882f428c818ae4098cada366a5bbaf Author: Carson Black <uhhadd@gmail.com> Date: Mon Sep 21 17:59:37 2020 -0400 Add repeat one track option Carson, could you take a look when you're able?
Fixed in https://commits.kde.org/elisa/503a7a68b2b7aa9d88afcc19a1d8f5744c60dee0! Thanks for the quick action.